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Hello together, I want to analyze the deviation between measured pyranometer data and the simulation output data. The investigated project consists of vertical bifacial PV modules on a agricultural land. On the site there are three pyranometers measuring GHI, front irradiance and back irradiance. To compare the measured irradiance and the PVsyst data I am unsure which simulation variable to use. My current idea: A) Front irradiance = GlobInc + ReflFrt I use GlobInc instead of GlobEff, because the front-pyranometer is not affected the same of the optical losses (shadings, IAM, soiling) like the modules. Question 1: Is that assumption right? Question 2: Is ReflFrt already included into GlobInc? B) Rear irradiance = GlobBak + ReflBck Question 3: Is ReflBck already included into GlobBak? Please answer the three questions and give me general feedback on what to consider for the comparison between measured operating data and simulation output data. Many thanks in advance!