Hi Robin, would you be willing to share a standard set with your normal spectral flats. The bad pixel removal is a final optional step and I am itching to get going?
IRAF uses different approaches to ISIS for both long-slit and echelle spectral extraction. It looks like the pros use both “dome” and sky/twilight flats rather than a prnu flat. As an example of the different approaches IRAF calibrates each “row” along the dispersion axis first, hence removing smile without a pixel by pixel translation, then does the extraction.
Regards Andrew
PS Anyone else willing to share some data with or without the two sets of spectral flats?