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Hello (again!) As I was playing around to find a simpler procedure for IRIS I noticed that the output values depend (a little) on the number of stars used to calculate the TC. I was using the reduction-beginner spreadsheet which calculates the final values for the check star eta Aur and eps Aur. When i was using only the eta aur and zet aur I was getting the normal value 3.172 as output value for the check star and consequently a value for eps aur. When I was using more stars (in our sample data for example I took into account all available stars) I could get some values close to 3.172 (like 3.174, 3.179) but some further away (like 2.966). The output values for eps aur in this case were not so much different than when I used only eta & zet aur. So it seems to me that there is not really a need to put so many stars there.Am I missing something?Regards Grigorisps I think thay Bikeman's spreadsheet has a much better format to include different sets of data so as to take the standard deviation. In the reduction-beginner it seems not right since the instrumental magntude can be different from set to set. I would suggest to implement this feature or (perhpas simpler) to put an output value for eta aur for checking at Bikeman's spreadsheet.