Hi,
Well, as I said, all things being equal…
You can see the curvature on the image and if it was this small discrepancy then that’s more lazy than I am! As long as there is no point of inflection along the dispersion then the spectrum can be corrected on the fly provided a few bright lines can be identified.
I’ve tried the method that C. Buil described using images of grids for distortion correction but it’s frankly not worth the trouble at your average meteor spectrum resolution.
Cheers,
Bill.