spectrum of lamp

Robin Leadbeater

Hi John,

 “I’ve processed the calibration image as is if were a star, of course I had to use the same image to calibrate it. The result was odd, but the neon 6965 line was incorrectly calibrated.”

The spectrum plot looks odd. Did you tick “sky not removed”  If you don’t do this it subtracts the lines from them selves, leaving almost nothing behind)