spectro-aras.com

Robin Leadbeater wrote:Hi Michel,

Here are my files(zip file attached.) Which one is different to yours ?

(I smoothed the MILES spectrum in the posted image to match the resolution of the Pickles spectrum and I still use ISIS 5.9.3 because I prefer that it corrects for the black body curve of the flat lamp but that should not be important here)

Cheers
Robin

Hi Robin,
Thank you for your answer.
For the comparison between the Pickles profile and the hd207260_miles_ISIS you sent me and mine: they correspond exactly
(with Y Offset=0.01 for readability): For the comparison between the profile “hd207260_miles_isis_dered_0p47” that you sent me and my profile “HD207260_Miles_derougie E(B-V)=0p47_normalisee”, there is a visible difference: It seems that with the same E(B-V)=0.47, the development operation performed is not identical.
Would it come from the calculation process for dered, or the ISIS version? I used the “Extinction” tab below: I wanted to do the same tests with your ISIS 5.9.3 version, but I didn’t find it on the Internet.

If necessary, attached my compressed files: Cheers.
Michel

Yes it looks like there has been an undocumented change in the way ISIS calculates the extinction.
http://www.spectro-aras.com/forum/viewt ... =10#p17284
I have opened a new thread here to see if anyone has more information
http://www.spectro-aras.com/forum/viewt ... =48&t=3031

Cheers
Robin

Thank you very much Robin for your help and all your explanations.
I’ll follow the new thread you just opened.
Cheers.
Michel