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Hi Paul,

Because you excluded almost all "hardware" issues, can you give it a try to process your data with a different software reduction program?
I am thinking of Demetra for eShel.
It is a while ago that I used Demetra for eShel, since I have no longer access to an eShel spectrograph, but I ...

Hi Robin,

You are right. Thanks!
Right click on the image icons of James in Windows Google Chrome browser or push and hold on Andoid, results in a drop down menu from which I can select to display the images.
Back now to the real topic: the echellograms for calibration.
Best regards
Hugo

Hi James,

I tried with the Firefox browser and it works! (Sorry, not your problem)

Best regards
Hugo

James,

I can't see your images either. Using google chrome browser on windows 10. Also not possible with Android smartphone. Only the icons of both images are visible. Login into the Aras forum makes no differece.
Best regards
Hugo

Bonjour à tous
Voici le spectre de la comète, réalisé avec un Star'Ex LR 300. Description en haut du graphique.
Les longueurs d'onde des raies moléculaires C2 et NH2 ont été arrondies à l'Ångström le plus proche et sont tirées de « A High-Resolution Catalog of Cometary Emission Lines » de Caltech ...