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I have written to you regarding few problems regarding "splot" but no answer. We have another problem regarding extracting spectra. We can take our spectra with the arc on the same image. In this case we can extract the object spectra and use the arc to calibrate it because both object and arc are in the same frame. But recently we took the object spectra and arc separately. Now our object and the arc are in two frames. But we can't take the object and arc in the same area of the frame. I mean the arc is always appeared beside the spectrum. See the attachment. If we extract the arc using "apall" by referring the object spectra is it correct?

I have attached

1. Object spectra
2. When Arc arc is added to object
3. Arc only Janaka Adassuriya
Research Scientist
Arthur C Clarke Institute
Katubedda, Moratuwa.
Sri Lanka.
Phone : +94 11 2651566
Fax : +94 11 2650462
E-mail : adassuriya@accmt.ac.lk ([email]adassuriya@accmt.ac.lk[/email])

See https://iraf.net/phpBB2/viewtopic.php?t=85084