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Suavi,
Another good catch!
A couple of things:
I see the ripple on the profile...I'd guess this is due to recording the spectral image with a tilt across the CCD.....
When you rotate the image to the horizontal you typically get this "staircase" effect from the pixels.
Much better to set the camera/ grating to give a horizontal image on the CCD.
I think your focus is pretty good, but just remember to focus on the spectrum - ignore the zero order image.....
At 60000 ADU you're over exposed...around 40000 will probably be better.
Onwards and upwards.
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