Hello, In the report of my simulations using bifacial modules, the GCR value that appears in "Backtracking strategy" is different from the one that appears in "Bifacial system". I did the maths, and it appears that it is because they do not take into account the same parameters to calculate the collector width : - in "Backtracking strategy" : L = length module + module spacing (defined in near shadings) - in "Bifacial system" : L = length module + module spacing (defined in near shadings) + frame (also defined in near shadings) In both situation the pitch is equal. Which GCR should I take into account in the end ? I would also be glad to hear any other explanation for the difference of GCR. Thank you for your help !