subroutine LeafGasFit_Stom(unitparamsout,unitwuecicacomp,
     &unitstomcomp,curveno,curvename,npoints0,aPPFDlf0,templeaf0,
     &tempair0,co2i_pa,co2a_pa,pres_air0,yAnet0,gswmeas0,vpdl0,trmmol0,
     &abspt_lf_par,co2c_pa,co2recycleratio,stargamma25,ha_stargamma,
!
     &  siteID,Latitude,Longitude,Elevation,yearsampled,
     &  sampledoy,GrowingSeasonStart,GrowingSeasonEnd,
     &  standage,CanopyHeight,LeafAreaIndex,species,
     &  avetimeresolution,avetimesampled,SampleHeight,
     &  Needleage,specificLAI,nitrogencontent,carboncontent,
     &  phoscontent,woodporosity,sapwooddensity,leafratio)
      implicit none
!
!----------Inputs-------------------------------------------
      integer npoints0,unitparamsout,unitwuecicacomp,unitstomcomp,
     &curveno
      double precision aPPFDlf0(npoints0),templeaf0(npoints0),
     &tempair0(npoints0),co2i_pa(npoints0),co2a_pa(npoints0),
     &pres_air0(npoints0),yAnet0(npoints0),gswmeas0(npoints0),
     &vpdl0(npoints0),trmmol0(npoints0),abspt_lf_par,
     &co2c_pa(4,npoints0),co2recycleratio0(6,npoints0),
     &stargamma25(6),ha_stargamma
      
      character*100 curvename
      character siteID*(*),species*(*),woodporosity*(*)
      double precision Latitude,Longitude,Elevation,yearsampled,
     &sampledoy,GrowingSeasonStart,GrowingSeasonEnd,standage,
     &CanopyHeight,LeafAreaIndex,avetimeresolution,avetimesampled,
     &SampleHeight,Needleage,specificLAI,nitrogencontent,
     &carboncontent,phoscontent,sapwooddensity,leafratio
!----------Internal variables-------------------------------
      integer npoints_stom,i,j,k,numparams,INFO,istommodel,malfit,
     &imodel,iwrong,idostom,idocica,idowue,npoints
      double precision co2threshold,co2current,vpdl_ref,gascon,
     &templeaf_stom(npoints0),gswmeas_stom(npoints0),
     &pres_air_stom(npoints0),xpco2i_stom(npoints0),
     &yAnet_stom(npoints0),trmmol_stom(npoints0),stargamma(npoints0),
     &pco2s(npoints0),rehulfsurf(npoints0),pvapordef_s(npoints0),
     &combined1(npoints0),combined2(npoints0),wue(npoints0),
     &wuemod(npoints0),wue_intrin(npoints0),wue_intrinmod(npoints0),
     &cicameas(npoints0),cicamod(npoints0),gswmodcp(npoints0),
     &gswmod1(npoints0),gswmod2(npoints0),gswmod(4,npoints0),
     &sig(npoints0),ballintersurf,ballslopesurf,ballrsqsurf,
     &ballinterinside,ballslopeinside,
     &ballrsqinside,ballinter,ballslope,ballrsqgsw,esat,raysurfinter,
     &raysurfslope,raysurfd0,raysurfrsqgsw,belindainter,belindaslope,
     &belindad0,belindarsqgsw,dewarinter,dewarslope,deward0,dewarrsqgsw,
     &wueref,der_wueref,rsqwue,alfit(10),der_alfit(10),wueref_intrin,
     &der_wueref_intrin,rsqwue_intrin,blfit(10),der_blfit(10),cicaref,
     &der_cicaref,rsqcica,avetleaf,avetair,avevpdl,avepari,term,
     &ballrmsgsw,ballagrindgsw,raysurfrmsgsw,raysurfagrindgsw,
     &belindarmsgsw,belindaagrindgsw,dewarrmsgsw,dewaragrindgsw,rmswue,
     &agrindwue,rmswue_intrin,agrindwue_intrin,stomintercept,stomslope,
     &rayDzero,rsqgsw,rmsgsw,agrindgsw,rmscica,agrindcica,cicafit(10),
     &der_cicafit(10),bmin(10),bmax(10),rsqccci(4),rmsccci(4),
     &agrindccci(4),cccifit(4,10),der_cccifit(4,10),ccciref(4),
     &der_ccciref(4),co2iref,cccimeas(4,npoints0),cccimod(4,npoints0),
     &avepres_air,rsqrecyc(6),rmsrecyc(6),agrindrecyc(6),recycfit(6,10),
     &der_recycfit(6,10),recycref(6),der_recycref(6),
     &recycmod(6,npoints0),aPPFDlf(npoints0),templeaf(npoints0),
     &tempair(npoints0),co2i_ppm(npoints0),co2a_ppm(npoints0),
     &pres_air(npoints0),yAnet(npoints0),gswmeas(npoints0),
     &vpdl(npoints0),trmmol(npoints0),co2c_ppm(4,npoints0),
     &co2recycleratio(6,npoints0)

      parameter(gascon=8.314472d0,co2threshold=0.0d0,co2current=400.0d0,
     &vpdl_ref=1600.0d0)
!if ambient co2 is too low, the ball-berry stomatal conductance model does not apply so we need to
!set up a threshold here
!this ambient CO2 threshold (250ppm) is taken from Gutschick and Simmonneau (2002)
!WUE are standardized for VPD at 50% relative humidity at 25 oC.

      external lfitbasisfuncs
!-------------------------------------------------------------------------------------------
      idostom=1
      idowue=1
      idocica=1
      npoints=0
      do j=1,npoints0
        if(gswmeas0(j).gt.0.0d0.and.co2i_pa(j).gt.0.0d0.and.
     &trmmol0(j).gt.0.0d0)then
          npoints=npoints+1
          aPPFDlf(npoints)=aPPFDlf0(j)         
          templeaf(npoints)=templeaf0(j)
          tempair(npoints)=tempair0(j)
          yAnet(npoints)=yAnet0(j)
          co2i_ppm(npoints)=co2i_pa(j)*1.0d+6/pres_air0(j)
          if(co2a_pa(j).gt.0.0d0)then
            co2a_ppm(npoints)=co2a_pa(j)*1.0d+6/pres_air0(j)
          else
            co2a_ppm(npoints)=-9999.0d0
            idocica=0
          endif
          pres_air(npoints)=pres_air0(j)
          gswmeas(npoints)=gswmeas0(j)
          trmmol(npoints)=trmmol0(j)
          vpdl(npoints)=vpdl0(j)
          do k=1,4
            if(dabs(co2c_pa(k,j)+9999.0d0).gt.1.0d-5)then
              co2c_ppm(k,npoints)=co2c_pa(k,j)*1.0d+6/pres_air0(j)
            else
              co2c_ppm(k,npoints)=-9999.0d0
            endif
          enddo
          do k=1,6
            co2recycleratio(k,npoints)=co2recycleratio0(k,j)
          enddo
        endif
      enddo
      if(npoints.le.3)return
      avevpdl=0.0d0
      avetleaf=0.0d0
      avetair=0.0d0
      avepari=0.0d0
      avepres_air=0.0d0
      do j=1,npoints          
        avevpdl=avevpdl+vpdl(j)
        avetleaf=avetleaf+templeaf(j)
        avetair=avetair+tempair(j)
        avepari=avepari+aPPFDlf(j)/abspt_lf_par
        avepres_air=avepres_air+pres_air(j)
      enddo
      avevpdl=avevpdl/dble(npoints)
      avetleaf=avetleaf/dble(npoints)-273.15d0
      avetair=avetair/dble(npoints)-273.15d0
      avepari=avepari/dble(npoints)
      avepres_air=avepres_air/dble(npoints)
      if(avepres_air.lt.0.0d0)avepres_air=98000.0d0
!$$$$$$$$$$$$ Fitting stomatal conductance models $$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$
!Now fit the stomatal conductance models   
      npoints_stom=-9999  
      if(idostom.eq.1)then
        npoints_stom=0
        do j=1,npoints
          if(co2a_ppm(j).gt.co2threshold.and.yAnet(j).gt.0.0d0)then
            npoints_stom=npoints_stom+1
            templeaf_stom(npoints_stom)=templeaf(j)
            pres_air_stom(npoints_stom)=pres_air(j)
            xpco2i_stom(npoints_stom)=co2i_ppm(j)
            yAnet_stom(npoints_stom)=yAnet(j)
            trmmol_stom(npoints_stom)=trmmol(j)
            gswmeas_stom(npoints_stom)=gswmeas(j)
          endif
        enddo
        if(npoints_stom.le.3)then
          idostom=0
        endif
      endif
      if(idostom.eq.1)then
        do j=1,npoints_stom
          call co2compens(templeaf_stom(j),stargamma25(5),ha_stargamma,
     &    gascon,stargamma(j))
!stargamma is in Pa, so convert it to ppm
          term=esat(templeaf_stom(j),pres_air_stom(j))
          stargamma(j)=1.0d+6*stargamma(j)/pres_air_stom(j)
          pco2s(j)=xpco2i_stom(j)+1.6d0*yAnet_stom(j)/gswmeas_stom(j)
!mole fraction
          pvapordef_s(j)=term/pres_air_stom(j)-
     &       0.001d0*trmmol_stom(j)/gswmeas_stom(j)          
!partial pressure
          pvapordef_s(j)=pres_air_stom(j)*pvapordef_s(j)
!partial pressure deficit
          pvapordef_s(j)=term-pvapordef_s(j)
          pvapordef_s(j)=dmax1(0.0d0,pvapordef_s(j))
          pvapordef_s(j)=dmin1(term,pvapordef_s(j))
          rehulfsurf(j)=1.0d0-pvapordef_s(j)/term
          combined1(j)=yAnet_stom(j)*rehulfsurf(j)/pco2s(j)
          combined2(j)=yAnet_stom(j)*rehulfsurf(j)/xpco2i_stom(j)
        enddo
        malfit=2
        do j=1,npoints_stom
          sig(j)=1.0d0
        enddo          
        call lfit(combined1,gswmeas_stom,sig,npoints_stom,alfit,
     &         malfit,malfit,lfitbasisfuncs,INFO)
        do j=1,npoints_stom
          gswmod1(j)=alfit(1)+alfit(2)*combined1(j)
        enddo
        call rsq_rms(gswmeas_stom,gswmod1,npoints_stom,rsqgsw,
     &          rmsgsw,agrindgsw)
        ballintersurf=alfit(1)
        ballslopesurf=alfit(2)
        ballrsqsurf=rsqgsw
        malfit=2
        do j=1,npoints_stom
          sig(j)=1.0d0
        enddo          
        call lfit(combined2,gswmeas_stom,sig,npoints_stom,alfit,
     &         malfit,malfit,lfitbasisfuncs,INFO)
        do j=1,npoints_stom
          gswmod2(j)=alfit(1)+alfit(2)*combined2(j)
        enddo
        call rsq_rms(gswmeas_stom,gswmod2,npoints_stom,rsqgsw,
     &          rmsgsw,agrindgsw)
        ballinterinside=alfit(1)
        ballslopeinside=alfit(2)
        ballrsqinside=rsqgsw
        do istommodel=1,4
          stomintercept=0.0001d0
          stomslope=10.0d0
          rayDzero=2000.0d0
          if(istommodel.le.3)then
            call StomRegression(npoints_stom,istommodel,pco2s,
     &        rehulfsurf,stargamma,yAnet_stom,gswmeas_stom,
     &        stomintercept,stomslope,pvapordef_s,rayDzero)
            call stomoptimization(npoints_stom,istommodel,pco2s,
     &        rehulfsurf,stargamma,yAnet_stom,gswmeas_stom,
     &        stomintercept,stomslope,pvapordef_s,rayDzero)
            do j=1,npoints_stom
              call StomatalConductance(pco2s(j),rehulfsurf(j),
     &stargamma(j),pvapordef_s(j),rayDzero,yAnet_stom(j),istommodel,
     &stomintercept,stomslope,term)
              gswmod(istommodel,j)=term
              gswmodcp(j)=term
            enddo
          endif
          if(istommodel.eq.4)then
!We experiment using internal CO2 to fit the dewar model
            call StomRegression(npoints_stom,istommodel,xpco2i_stom,
     &        rehulfsurf,stargamma,yAnet_stom,gswmeas_stom,
     &        stomintercept,stomslope,pvapordef_s,rayDzero)
            call stomoptimization(npoints_stom,istommodel,xpco2i_stom,
     &        rehulfsurf,stargamma,yAnet_stom,gswmeas_stom,
     &        stomintercept,stomslope,pvapordef_s,rayDzero)
            do j=1,npoints_stom
              call StomatalConductance(xpco2i_stom(j),
     &          rehulfsurf(j),stargamma(j),pvapordef_s(j),rayDzero,
     &          yAnet_stom(j),istommodel,
     &          stomintercept,stomslope,term)
              gswmod(istommodel,j)=term
              gswmodcp(j)=term
            enddo
          endif
          call rsq_rms(gswmeas_stom,gswmodcp,
     &       npoints_stom,rsqgsw,rmsgsw,agrindgsw)
          if(istommodel.eq.1)then
            ballinter=stomintercept
            ballslope=stomslope
            ballrsqgsw=rsqgsw
            ballrmsgsw=rmsgsw
            ballagrindgsw=agrindgsw
          endif
          if(istommodel.eq.2)then
            raysurfinter=stomintercept
            raysurfslope=stomslope
            raysurfd0=rayDzero
            raysurfrsqgsw=rsqgsw
            raysurfrmsgsw=rmsgsw
            raysurfagrindgsw=agrindgsw
          endif
          if(istommodel.eq.3)then
            belindainter=stomintercept
            belindaslope=stomslope
            belindad0=-9999.0d0
            belindarsqgsw=rsqgsw
            belindarmsgsw=rmsgsw
            belindaagrindgsw=agrindgsw
          endif
          if(istommodel.eq.4)then
            dewarinter=stomintercept
            dewarslope=stomslope
            deward0=rayDzero
            dewarrsqgsw=rsqgsw
            dewarrmsgsw=rmsgsw
            dewaragrindgsw=agrindgsw
          endif
        enddo
        do j=1,npoints_stom
          write(unitstomcomp,370)curveno,trim(curvename),
     &    gswmeas_stom(j),gswmod1(j),gswmod2(j),gswmod(1,j),
     &    gswmod(2,j),gswmod(3,j),gswmod(4,j),xpco2i_stom(j),
     &    pco2s(j),rehulfsurf(j),stargamma(j),pvapordef_s(j),
     &    pres_air_stom(j),yAnet_stom(j)
        enddo
      else
        ballintersurf=-9999.0d0
        ballslopesurf=-9999.0d0
        ballrsqsurf=-9999.0d0
        ballinterinside=-9999.0d0
        ballslopeinside=-9999.0d0
        ballrsqinside=-9999.0d0
        ballinter=-9999.0d0
        ballslope=-9999.0d0
        ballrsqgsw=-9999.0d0
        ballrmsgsw=-9999.0d0
        ballagrindgsw=-9999.0d0
        raysurfinter=-9999.0d0
        raysurfslope=-9999.0d0
        raysurfd0=-9999.0d0
        raysurfrsqgsw=-9999.0d0
        raysurfrmsgsw=-9999.0d0
        raysurfagrindgsw=-9999.0d0
        belindainter=-9999.0d0
        belindaslope=-9999.0d0
        belindad0=-9999.0d0
        belindarsqgsw=-9999.0d0
        belindarmsgsw=-9999.0d0
        belindaagrindgsw=-9999.0d0
        dewarinter=-9999.0d0
        dewarslope=-9999.0d0
        deward0=-9999.0d0
        dewarrsqgsw=-9999.0d0
        dewarrmsgsw=-9999.0d0
        dewaragrindgsw=-9999.0d0
      endif
!$$$$$$$$$$$$ End of Stomatal Conductance Fit $$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$
!Now analyze the relationship of water use efficiency with ambient CO2
      if(idowue.eq.1)then
        do j=1,npoints
          wue(j)=yAnet(j)/trmmol(j)
          sig(j)=1.0d0
        enddo
!        malfit=3
!        do j=1,npoints
!          sig(j)=1.0d0
!        enddo
!        call lfit(co2a_ppm,wue,sig,npoints,alfit,malfit,malfit,
!     &              lfitbasisfuncs,INFO)
!        do j=1,npoints
!          wuemod(j)=alfit(1)+alfit(2)*co2a_ppm(j)+alfit(3)*
!     &                co2a_ppm(j)*co2a_ppm(j)/1000.0d0
!        enddo
!        call rsq_rms(wue,wuemod,npoints,rsqwue,rmswue,agrindwue)
!        wueref=alfit(1)+alfit(2)*co2current+alfit(3)*
!     &                co2current*co2current/1000.0d0
!        der_wueref=alfit(2)+2.0d0*alfit(3)*co2current/1000.0d0
        
        alfit(1)=1.0d0
        alfit(2)=0.1d0
        alfit(3)=-20.0d0
        alfit(4)=0.1d0 
        alfit(5)=100.0d0
        bmin(1)=-1.0d+3
        bmax(1)=1.0d+4
        bmin(2)=-1.0d+4
        bmax(2)=1.0d+5
        bmin(3)=-1.0d+5
        bmax(3)=1.0d+5
        bmin(4)=-1.0d+5
        bmax(4)=1.0d+5
        bmin(5)=-1.0d+5
        bmax(5)=1.0d+5
        imodel=1
        numparams=5
        call cica_Regression5(npoints,wue,co2a_ppm,alfit,numparams,
     &imodel,bmin,bmax)
        call cicaoptimization5(npoints,wue,co2a_ppm,alfit,numparams,
     &imodel,bmin,bmax)
        do j=1,npoints
          call cica_ca5(imodel,numparams,alfit,co2a_ppm(j),wuemod(j),
     &der_wueref,der_alfit)
        enddo
        call cica_ca5(imodel,numparams,alfit,co2current,wueref,
     &der_wueref,der_alfit)
        call rsq_rms(wue,wuemod,npoints,rsqwue,rmswue,agrindwue)
!------------------------------------------------------------------------------
        do j=1,npoints
          wue_intrin(j)=yAnet(j)/gswmeas(j)
        enddo
!        call lfit(co2a_ppm,wue_intrin,sig,npoints,blfit,malfit,
!     &      malfit,lfitbasisfuncs,INFO)
!        do j=1,npoints
!          wue_intrinmod(j)=blfit(1)+blfit(2)*co2a_ppm(j)+
!     &             blfit(3)*co2a_ppm(j)*co2a_ppm(j)/1000.0d0
!        enddo
!        call rsq_rms(wue_intrin,wue_intrinmod,npoints,rsqwue_intrin,
!     &                 rmswue,agrindwue)
!        wueref_intrin=blfit(1)+blfit(2)*co2current+blfit(3)*
!     &                co2current*co2current/1000.0d0
!        der_wueref_intrin=blfit(2)+2.0d0*blfit(3)*co2current/1000.0d0
        
        blfit(1)=1.0d0
        blfit(2)=0.10
        blfit(3)=-20.0d0
        blfit(4)=0.1d0 
        blfit(5)=100.0d0
        
        bmin(1)=-1.0d+5
        bmax(1)=1.0d+5
        bmin(2)=-1.0d+5
        bmax(2)=1.0d+5
        bmin(3)=-1.0d+5
        bmax(3)=1.0d+5
        bmin(4)=-1.0d+5
        bmax(4)=1.0d+5
        bmin(5)=-1.0d+5
        bmax(5)=1.0d+5
        numparams=5
        imodel=1
        call cica_Regression5(npoints,wue_intrin,co2a_ppm,
     &blfit,numparams,imodel,bmin,bmax)
        call cicaoptimization5(npoints,wue_intrin,co2a_ppm,
     &blfit,numparams,imodel,bmin,bmax)
        do j=1,npoints
          call cica_ca5(imodel,numparams,blfit,co2a_ppm(j),
     &wue_intrinmod(j),der_wueref_intrin,der_blfit)
        enddo
        call cica_ca5(imodel,numparams,blfit,co2current,
     &wueref_intrin,der_wueref_intrin,der_blfit)
        call rsq_rms(wue_intrin,wue_intrinmod,npoints,rsqwue_intrin,
     &rmswue,agrindwue)
      else
        rsqwue=-9999.0d0
        rmswue=-9999.0d0
        agrindwue=-9999.d0
        wueref=-9999.0d0
        der_wueref=-9999.0d0
        avevpdl=-9999.0d0
        avetleaf=-9999.0d0
        avetair=-9999.0d0
        do j=1,npoints
          wue(j)=-9999.0d0
          wuemod(j)=-9999.0d0
          wue_intrin(j)=-9999.0d0
          wue_intrinmod(j)=-9999.0d0
        enddo
        rsqwue_intrin=-9999.0d0
        wueref_intrin=-9999.0d0
        der_wueref_intrin=-9999.0d0
        do j=1,numparams
          alfit(j)=-9999.0d0
          blfit(j)=-9999.0d0
        enddo
      endif

!----------------------------------------------------------------------------
!Now analyze the relationship of Ci/Ca ratio with ambient CO2 and Cc/Ci with Ci
100   term=co2a_ppm(1)
      do j=2,npoints
        if(co2a_ppm(j).gt.term)then
          term=co2a_ppm(j)
        endif
      enddo
      bmin(1)=-1.0d+2
      bmax(1)=1.0d+2
      bmin(2)=-300.0d0/term
      bmax(2)=1.0d+6
                
      if(idocica.eq.1)then          
        do j=1,npoints
          cicameas(j)=co2i_ppm(j)/co2a_ppm(j)
        enddo

!Ci/Ca=a*exp(-b*Ca)+c+d*ln(co2a)+e*(ln(co2))**2

        cicafit(1)=1.5874d0
        cicafit(2)=2.0343d0
        cicafit(3)=0.8779d0
        cicafit(4)=0.1d0
        cicafit(5)=0.01d0

        bmin(3)=-1.0d+2
        bmax(3)=1.0d+2
        bmin(4)=-1.0d+2
        bmax(4)=1.0d+2
        bmin(5)=-1.0d+2
        bmax(5)=1.0d+2
        
        numparams=5
        imodel=3
        call cica_Regression5(npoints,cicameas,co2a_ppm,
     &cicafit,numparams,imodel,bmin,bmax)
        call cicaoptimization5(npoints,cicameas,co2a_ppm,
     &cicafit,numparams,imodel,bmin,bmax)
        do j=1,npoints
          call cica_ca5(imodel,numparams,cicafit,co2a_ppm(j),
     &cicamod(j),der_cicaref,der_cicafit)
        enddo
        call cica_ca5(imodel,numparams,cicafit,co2current,
     &cicaref,der_cicaref,der_cicafit)
        call rsq_rms(cicameas,cicamod,npoints,rsqcica,rmscica,
     &                 agrindcica)
      else
        do j=1,npoints
          cicamod(j)=-9999.0d0
        enddo
        rsqcica=-9999.0d0
        rmscica=-9999.0d0
        agrindcica=-9999.0d0
        cicaref=-9999.0d0
        der_cicaref=-9999.0d0
        do j=1,numparams
          cicafit(j)=-9999.0d0
          der_cicafit(j)=-9999.0d0
        enddo
      endif
!--------------------------------------------------------------------------
!below we fit Cc/Ci
110   do i=1,4
        do j=1,npoints
          cccimeas(i,j)=co2c_ppm(i,j)/co2i_ppm(j)
        enddo
        if(co2c_ppm(i,1).ge.0.0d0)then
          cccifit(i,1)=2.5874d0
          cccifit(i,2)=2.0343d0
          cccifit(i,3)=0.8779d0
          cccifit(i,4)=0.1d0       
          cccifit(i,5)=0.01d0
          cccifit(i,6)=0.001d0

          bmin(3)=-1.0d+2
          bmax(3)=1.0d+2
          bmin(4)=-1.0d+2
          bmax(4)=1.0d+2
          bmin(5)=-1.0d+2
          bmax(5)=1.0d+2
          bmin(6)=-1.0d+2
          bmax(6)=1.0d+2

          numparams=6
          imodel=3
          call cica_Regression5(npoints,cccimeas(i:i,1:npoints),
     &co2i_ppm,cccifit(i:i,1:numparams),numparams,imodel,bmin,bmax)
          call cicaoptimization5(npoints,cccimeas(i:i,1:npoints),
     &co2i_ppm,cccifit(i:i,1:numparams),numparams,imodel,bmin,bmax)
          do j=1,npoints
            call cica_ca5(imodel,numparams,cccifit(i:i,1:numparams),
     &co2i_ppm(j),cccimod(i,j),der_ccciref(i),der_cccifit)
          enddo
          if(dabs(cicaref+9999.0d0).gt.1.0d-5)then
            co2iref=cicaref*co2current
          else
            co2iref=0.75d0*co2current
          endif
          call cica_ca5(imodel,numparams,cccifit(i:i,1:numparams),
     &co2iref,ccciref(i),der_ccciref(i),der_cccifit)
          call rsq_rms(cccimeas(i:i,1:npoints),cccimod(i:i,1:npoints),
     &npoints,rsqccci(i),rmsccci(i),agrindccci(i))
        else
          do j=1,npoints
            cccimod(i,j)=-9999.0d0
          enddo
          rsqccci(i)=-9999.0d0
          rmsccci(i)=-9999.0d0
          agrindccci(i)=-9999.0d0
          ccciref(i)=-9999.0d0
          der_ccciref(i)=-9999.0d0
          do j=1,numparams
            cccifit(i,j)=-9999.0d0
          enddo
        endif
      enddo
!-----------------------------------------------------------------------
!now we fit CO2 recycling ratio
      do i=1,6
        if(co2recycleratio(i,1).ge.0.0d0)then
          recycfit(i,1)=2.5874d0
          recycfit(i,2)=2.0343d0
          recycfit(i,3)=0.8779d0
          recycfit(i,4)=0.1d0       
          recycfit(i,5)=0.01d0
          recycfit(i,6)=0.001d0
          bmin(3)=-1.0d+2
          bmax(3)=1.0d+2
          bmin(4)=-1.0d+2
          bmax(4)=1.0d+2
          bmin(5)=-1.0d+2
          bmax(5)=1.0d+2
          bmin(6)=-1.0d+2
          bmax(6)=1.0d+2
          numparams=5
          imodel=3
          call cica_Regression5(npoints,co2recycleratio(i:i,1:npoints),
     &co2i_ppm,recycfit(i:i,1:numparams),numparams,imodel,bmin,bmax)
          call cicaoptimization5(npoints,co2recycleratio(i:i,1:npoints),
     &co2i_ppm,recycfit(i:i,1:numparams),numparams,imodel,bmin,bmax)
          do j=1,npoints
            call cica_ca5(imodel,numparams,recycfit(i:i,1:numparams),
     &co2i_ppm(j),recycmod(i,j),der_recycref(i),der_recycfit)
          enddo
          if(dabs(cicaref+9999.0d0).gt.1.0d-5)then
            co2iref=cicaref*co2current
          else
            co2iref=0.75d0*co2current
          endif
          call cica_ca5(imodel,numparams,recycfit(i:i,1:numparams),
     &co2iref,recycref(i),der_recycref(i),der_recycfit)
          call rsq_rms(co2recycleratio(i:i,1:npoints),
     &recycmod(i:i,1:npoints),npoints,rsqrecyc(i),rmsrecyc(i),
     &agrindrecyc(i))
        else
          do j=1,npoints
            recycmod(i,j)=-9999.0d0
          enddo
          rsqrecyc(i)=-9999.0d0
          rmsrecyc(i)=-9999.0d0
          agrindrecyc(i)=-9999.0d0
          recycref(i)=-9999.0d0
          der_recycref(i)=-9999.0d0
          do j=1,numparams
            recycfit(i,j)=-9999.0d0
          enddo
        endif
      enddo
!-----------------------------------------------------------------------
      do j=1,npoints
        write(unitwuecicacomp,380)curveno,trim(curvename),co2a_ppm(j),
     &vpdl(j),wue(j),wuemod(j),cicameas(j),cicamod(j),wue_intrin(j),
     &wue_intrinmod(j),(cccimeas(k,j),cccimod(k,j),k=1,4),
     &(co2recycleratio(k,j),recycmod(k,j),k=1,6)
      enddo
      write(unitparamsout,390)curveno,trim(curvename),npoints_stom,
     &co2threshold,co2current,vpdl_ref,ballintersurf,ballslopesurf,
     &ballrsqsurf,ballinterinside,ballslopeinside,ballrsqinside,
     &ballinter,ballslope,ballrsqgsw,raysurfinter,raysurfslope,
     &raysurfd0,raysurfrsqgsw,belindainter,belindaslope,
     &belindad0,belindarsqgsw,dewarinter,dewarslope,deward0,
     &dewarrsqgsw,wueref,der_wueref,rsqwue,(alfit(i),i=1,5),
     &wueref_intrin,der_wueref_intrin,rsqwue_intrin,(blfit(i),i=1,5),
     &cicaref,der_cicaref,rsqcica,(cicafit(i),i=1,5),
     &avetleaf,avetair,avevpdl,avepari,(ccciref(i),der_ccciref(i),
     &rsqccci(i),(cccifit(i,j),j=1,6),i=1,4),
     &(recycref(i),der_recycref(i),
     &rsqrecyc(i),(recycfit(i,j),j=1,5),i=1,6),
!     
     &trim(siteID),Latitude,Longitude,Elevation,yearsampled,
     &sampledoy,GrowingSeasonStart,GrowingSeasonEnd,
     &standage,CanopyHeight,LeafAreaIndex,trim(species),
     &avetimeresolution,avetimesampled,SampleHeight,
     &Needleage,specificLAI,nitrogencontent,carboncontent,
     &phoscontent,trim(woodporosity),sapwooddensity,leafratio
370   format(i0,',',a,',',13(f0.8,','),f0.8)
380   format(i0,',',a,',',27(f0.8,','),f0.8)
390   format(i0,',',a,',',i0,',',136(f0.8,','),a,',',10(f0.8,','),
     &a,',',8(f0.8,','),a,',',f0.8,',',f0.8)
      return
      end subroutine LeafGasFit_Stom