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Thanks, Robin.

I was missing the step "First crop the bad regions by double clicking either side of them."
David Boyd pointed me to this and then again your instructions are crystal clear!

My processing seems to be fully working at last.

I understand the procedure. I reckon it can not be done in the "profile" tab. In "calibration" tab there is a "response assistant" button. Using this seems to work pretty well. I tried and obtained this comparison between the result and the Mile's spectrum. Comparison.j...

If i crop out the telluric lines area, the final spectrum will not show that area neither. Demetra does not crop it out. It just smoothes that area with a filter, i guess. I can also use a filter in ISIS but it will smooth the whole response spectrum, not just an area. With Demetra, the final spectr...

Hello. I am still fighting to fully understand how to use ISIS. I found another problem. After processing the spectrum, i get the telluric lines at the red part of the spectrum as emision lines, obviously wrong. In the next image, the blue filter, processed with ISIS shows some of those lines. On th...

Hello.

I unchecked the optimal binning and now it works perfectly even processing all the 170 spectra.
Checking optimal binning and setting a rejection office above 30 also works, but unchecking it results look better!


Thanks Robin.

Here are four raw images. https://www.dropbox.com/sh/8zsdy7i5v4k9ymn/AACdLNOWHx5cQAql8rrYPSwba?dl=0 The ones ending in 20 and 22 give good results. The ones ending in 33 and 38 are the problematic ones. I could not attach them here so i am including a link to my Dropbox where the images are for anyb...

Thanks, Robin. Optimal binning is checked. Saturation also was checked. The images are very far from saturation. I am not using the cosmic filter. I did many tests with different levels but results are worse always in many spectra. Besides, in Astrosurf manual says, regarding the cosmic filter, &quo...

And answering to Tom. The 2 minutes exposure was requested for the project. I was asked to expose between 2 and 5 minutes, being 2 the preferred time. The idea is to observe a flare and those normally last a few minutes. Regearding the gain, i think you are refering to a CMOS? I am using an Atik 460...

Hello. I have checked the few extrange looking images, yes. They look fine to me. Guiding was also checked, it went well, ±1 arcsec the whole night on average. There are a few peaks of 1.5 or 2 arc sec error but none of them coincide with the times those images were taken. And the strange issue is t...

Hello. The exposure time for each image was two minutes. Not short! Anyway, i managed to solve the problem. IWhen i observed the problem, i was using a low Rejection Coefficient of 5. When changed to a value above 25 -i tried many different values-, the process goes well. What i do not understand is...