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If you want to experiment with star spectra there is an excellent program called spectra.exe, Google it. This program has the software to print a diffraction grate on clear film with a laser printer to place in front of your telescope while you take a shot of the star with your CCD. Read the manual that comes with it.
I found this program years ago (DOS era) but it is still available and runs at the command prompt or in a window. It is free!
Barry
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