Hi, i want to find the performances parameters (yf,ya,yr,PR)from measured data using PVsyst software. i used a Tools>Import ASCII Hourly file.after that i used Tools>Data tables and graphs, all variable can plotted correctely but Special Graphs for measured data its does not work correctely . are there any other methodes to find measured (yf,ya,yr,PR) in PVsyst. i had already 4 years stuck in this step. with every version of PVsyst i hope they fix that but the same problem . please any suggestion. thank you very much.