[Ifeffit] Rbkg value in Athena

[Scott Calvin]

Hi Ann,

If your fit is significantly altered by small changes in Rbkg or 
emin, that in itself is a warning that your background parameters are 
probably not appropriate. I always try to make sure the background 
I'm using gives fits that are stable to small changes in the 
background parameters; i.e. I look for a region of stability.

--Scott Calvin
Sarah Lawrence College

>
>I am a little bit confused on what the Rbkg value should be when I 
>do the background subtraction.  I have read some previous posts 
>which stated that Rbkg can be determined after the fit.  However, I 
>always think that the fit depends strongly on how the background 
>being subtracted.  How does the initial spline value affect the 
>background subtraction?  Should it be 1eV  or 25 eV above the edge? 
>I appreciate your help.
>
>Thanks,
>
>Ann
>