Jon Peltier used a VBA technique to fill the area under the curve. It works
with me fine but if the value of the Y coordinate is below 0.001 then the the
procedure crashes.

Is there a way to correct the procedure??

See this chart for illustration
http://phpaw.com/myscrpit/milt-up/jp...1124275474.jpg

Link to Jon Peltier's page
http://peltiertech.com/Excel/Charts/VBAdraw.html