Creating a flat image according to the IRIS tutorial
Hallo - and another beginner problem:
After having finished the IRIS tutorial successfully with the given data, I eagerly started to process my own images. My attempts now have com to a sudden stop at Step 3 "Processing", at 5.1.
I already created an saved a master-bias and a master dark. The first two commands beginning with "sub2" and "opt2" seem to work well. After "ngain2 i 1000 i 3" there is an " ERROR: Determination impossible
What might have gone wrong?
Is there maybe another way of creating flats that can be recommended to beginners. As I have learned elsewhere in this blog the answer seems to be "No"
Thank You for any help