[Ifeffit] r-factor

Hi Everyone, I have a question about Artemis log file. I noticed that two r-factors are reported in the log file. One is in the fifth line and it is called 'R-factor' and the other one is under the data set fitting conditions and it is called 'r-factor for this data set'. They have in general different values. What does it mean? Which is the difference between the two? Lisa