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What revision of EZChrom are you using (Help>About)? We will also need to determine what type of report template you are using since EZChrom has a few reporting options. Does your report template have a .rep, .tpl, or .rdl extension?
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fist you group type will be defined as calibrated range .
then if you use standard report, you will choose the group when you do the customer report.
if you use the intelligent report ,you will add the summed peak