Peter,
That is very much appreciated. I had in the meantime used the pixinsight script, previously unknown to me, to generate one, but the result did not match up to yours. It helps knowing what you are doing and understanding all of the options for sure.
Once again many thanks. I'll go back and run the calibrated files through cosmetic correction again using your one. Very timely as well as I've only just just started working on M16.
Best regards,
Ray