Data Reduction Frequently Asked Questions
What do I do if recipe fails because frames are not classified?
Occasionally you may see an "UNDEF" in the "Classication" column of gasgano recipe window. This either means that there is a problem with the FITS headers (DPR.CATG, DPR.TECH and/or DPR.TYPE), or that the rules set used to classify the frames is not loaded and/or is faulty. You can still force gasgano to do a reduction by entering the classication by hand, for example click on "UNDEF" and change to "CALPRO FLAT" if you are sure that image is a master flatfield.
An alternative solution could be to change the header of the files that gasgano fails to classify, so that they can be classified (for expert users only).