SNR in ISIS

[David Cejudo]

Hello.

In ISIS's profile tab, clicking FWHM a window appears with several calculations.
There are three different values for SNR.
If i am not wrong, the first value is SNR = Average/Deviation

What about SNR (2) and SNR (3)? How are they calculated?

Which of those SNR should be my goal if i want to reach SNR = 100?

Thanks for advice.

David Cejudo.

[David Boyd]

Hello David,

This posting by Christian on the Forum should answer your question.

http://www.spectro-aras.com/forum/viewt ... isis#p7177

David

[Ken Harrison]

There's a copy of the DER SNR spreadsheet in the files area of the astronomical spectroscopy group if you want to check it out.
https://groups.io/g/astronomicalspectro ... es/DER_SNR