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FUNCTION evlmem(fdt,d,m,xms)
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INTEGER m
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REAL evlmem,fdt,xms,d(m)
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INTEGER i
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REAL sumi,sumr
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DOUBLE PRECISION theta,wi,wpi,wpr,wr,wtemp
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theta=6.28318530717959d0*fdt
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wpr=cos(theta)
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wpi=sin(theta)
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wr=1.d0
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wi=0.d0
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sumr=1.
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sumi=0.
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do 11 i=1,m
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wtemp=wr
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wr=wr*wpr-wi*wpi
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wi=wi*wpr+wtemp*wpi
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sumr=sumr-d(i)*sngl(wr)
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sumi=sumi-d(i)*sngl(wi)
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11 continue
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evlmem=xms/(sumr**2+sumi**2)
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return
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END
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