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Bojan,
Well I managed to get something.
Assuming your 200lpm at a distance of 135mm, the dispersion should be around 2.6 A/pixel.....
If I apply a x5 Gaussian smoothing filter to your spectrum, use the M1III comparison, (purple curve) and assume that the absorption lines out in the red are O2 and Atmosphere, I can get a result at 3A/ pixel....
I've also included a spectrum from the ETX website for reference.
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