diff --git a/WebCms/Models/LeafDataQuery.cs b/WebCms/Models/LeafDataQuery.cs
index e0044f0..b2da7cc 100644
--- a/WebCms/Models/LeafDataQuery.cs
+++ b/WebCms/Models/LeafDataQuery.cs
@@ -35,7 +35,13 @@ namespace LeafWeb.WebCms.Models
         [Display(Name = "Range")]
         [RegularExpression(@"^([0-9]|[1-8][0-9]|9[0-9]|1[0-7][0-9]|180)$", ErrorMessage = "± longitude degrees")]
         public string lonr { get; set; }
-        
+
+        /// <summary>Sample CO2 concentration</summary>
+        //[ParseInfo(17, units: "umol/mol")]
+        [Display(Name = "CO2 response curves")]
+        [RegularExpression(@"^([0-9]*\.[0-9]+|[0-9]+)$", ErrorMessage = "Value is numeric")]
+        public string co2s { get; set; }
+
         public bool HasExtendedParameters =>
             !(
                 string.IsNullOrEmpty(siteid)
@@ -44,6 +50,7 @@ namespace LeafWeb.WebCms.Models
                 && string.IsNullOrEmpty(latr)
                 && string.IsNullOrEmpty(lon)
                 && string.IsNullOrEmpty(lonr)
+                && string.IsNullOrEmpty(co2s)
             );
     }
 }
\ No newline at end of file
diff --git a/WebCms/Utility/QueryFilter.cs b/WebCms/Utility/QueryFilter.cs
index 4dabbf0..fb2599a 100644
--- a/WebCms/Utility/QueryFilter.cs
+++ b/WebCms/Utility/QueryFilter.cs
@@ -58,7 +58,7 @@ namespace LeafWeb.WebCms.Utility
 
             if (!string.IsNullOrEmpty(query.lon))
             {
-                var longitude = Int32.Parse(query.lon);
+                var longitude = int.Parse(query.lon);
                 var range = 0;
                 if (!string.IsNullOrEmpty(query.lonr))
                 {
@@ -73,6 +73,20 @@ namespace LeafWeb.WebCms.Utility
                     select li;
             }
 
+            if (!string.IsNullOrEmpty(query.co2s))
+            {
+                var co2s = double.Parse(query.co2s);
+
+                resultItems =
+                    from li in resultItems
+                    where co2s >=
+                          li.LeafInputData.Max(lid =>
+                              lid.Data.Max(d => d.CO2S) -
+                              lid.Data.Min(d => d.CO2S)
+                              )
+                    select li;
+            }
+
             return resultItems;
         }
     }
diff --git a/WebCms/Views/Queue/Index.cshtml b/WebCms/Views/Queue/Index.cshtml
index 0f5f158..67873b1 100644
--- a/WebCms/Views/Queue/Index.cshtml
+++ b/WebCms/Views/Queue/Index.cshtml
@@ -71,6 +71,14 @@
                     </div>
                 </div>
             </div>
+            <hr />
+            <div class="row">
+                <div class="col">
+                    <div class="text-body">Curve Variation range minimum</div>
+
+                    @Html.EditorFor(m => m.Q.co2s, new { size = "small", append = "umol/m" })
+                </div>
+            </div>
         </div>
     </div>
 }
diff --git a/WebCms/Views/Shared/DisplayTemplates/LeafInputDataViewModels.cshtml b/WebCms/Views/Shared/DisplayTemplates/LeafInputDataViewModels.cshtml
index 110c1de..32db1f8 100644
--- a/WebCms/Views/Shared/DisplayTemplates/LeafInputDataViewModels.cshtml
+++ b/WebCms/Views/Shared/DisplayTemplates/LeafInputDataViewModels.cshtml
@@ -2,15 +2,30 @@
 @{
     //Layout = "~/Views/Shared/DisplayTemplates/_FieldLayout.cshtml";
 }
+<div class="row pb-lg-2 pb-sm-1">
+    <div class="col text-truncate border-right border-bottom font-weight-bold">
+        Leaf Input Data
+    </div>
+</div>
+@RendDistinctValues("Site Id", Model.Select(m => m.SiteName))
+@RendDistinctValues("Latitude [&deg;]", Model.Select(m => m.Site.Latitude?.ToString()))
+@RendDistinctValues("Longitude [&deg;]", Model.Select(m => m.Site.Longitude?.ToString()))
+@RendDistinctValues("Elevation [m]", Model.Select(m => m.Site.Elevation?.ToString()))
+@RendDistinctValues("CO2S", 
+    Model.Select(m => 
+        m.SiteName + ": " 
+        + string.Join(", ", 
+            m.Data?.Select(d => d.CO2S?.ToString())
+            )
+        )
+    )
+@RendDistinctValues("CO2S Min", Model.Select(m => m.Data?.Min(d => d.CO2S).ToString()))
+@RendDistinctValues("CO2S Average", Model.Select(m => m.Data?.Average(d => d.CO2S).ToString()))
+@RendDistinctValues("CO2S Max", Model.Select(m => m.Data?.Max(d => d.CO2S).ToString()))
 
-@Rend("Site Id", Model.Select(m => m.SiteName))
-@Rend("Latitude [&deg;]", Model.Select(m => m.Site.Latitude?.ToString()))
-@Rend("Longitude [&deg;]", Model.Select(m => m.Site.Longitude?.ToString()))
-@Rend("Elevation [m]", Model.Select(m => m.Site.Elevation?.ToString()))
 
-@helper Rend(string label, IEnumerable<string> values)
+@helper RendValue(string label, string value)
 {
-    var value = string.Join(", ", values.Distinct());
     <div class="row pb-lg-2 pb-sm-1 @if (ViewData.Model == null){<text>d-none</text> }">
         <div class="col-sm-3 text-truncate border-right border-bottom pl-4 pl-sm-5">
             @Html.Raw(label)
@@ -21,13 +36,8 @@
     </div>
 }
 
-
-@*@grid.GetHtml(columns:
-    grid.Columns(
-        grid.Column("SiteId"),
-        grid.Column("Latitude"),
-        grid.Column("Longitude"),
-        grid.Column("Elevation")
-        ),
-    htmlAttributes: new { @class = "table table-sm table-striped table-bordered table-hover" }
-    )*@
+@helper RendDistinctValues(string label, IEnumerable<string> values)
+{
+    var value = string.Join(", ", values.Distinct());
+    @RendValue(label, value)
+}
\ No newline at end of file