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15 February 2025 at 3:44 pm
#628123

Keymaster
Hi Ken,
I expect you have already done this, but I thought I would mention it just in case. Where there is an unexpected difference in the intensity between two lines, my first thought is to check the response correction. Not just whether you have good confidence in your own spectrum, but also the one you were supplied with. I imagine the response correction would have to be obtained at night by a observing a star, with the spectrograph in the same configuration as the daytime solar spectrum.
Sorry I am not able to provide a spectrum.
Best wishes,
Andy