Reply To: Issues with ISIS Tutorial for Star Anayser › Forums › Spectroscopy › Issues with ISIS Tutorial for Star Anayser › Reply To: Issues with ISIS Tutorial for Star Anayser 18 March 2023 at 10:56 am #616281 JomiderParticipant Sorry Robin, I realise no flats for slitless havingread your piece, just darks and offset All the best Jonathan Jonathan
