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From: doronl@wise1.tau.ac.il
Subject: rgsproc task / enlarging the extraction region.
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Date: Wed, 30 Jun 2004 14:16:42 GMT
From: doronl@wise1.tau.ac.il
To: xmmhelp@xmm.vilspa.esa.es
CC: doronl@wise1.tau.ac.il
Subject: rgsproc task / enlarging the extraction region.
Full_Name: Doron Lemze
Submission from: (NULL) (132.66.16.12)


Dear colleague,
 
Thank you for the quick and straight to the point answer about how to enlarge
the extraction region. However there are still some unclear issues in my mind.
I have two questions.
 
1)  I understood that in order to enlarge the extraction region of the
cross-dispersion I need to enlarge the percentage of the cross-dispersion PSF. I
do it by changing the following parameters: xpsfbelow, xpsfabove, and xpsfexcl.
I know the size of of my extended source and I look for an easy way of
converting the angular size of it, let us say 2 arcmin, to the percentage of the
cross-dispersion PSF. I don't want to 'try and check'. It is important to
mention that my source is weak, so I can't see it in the plot. How can I convert
it from angular size to the percentage of the cross-dispersion PSF ?
 
2) In order to enlarge the extraction region I need to write the following
commands:
rgsregions srclist='PxxxxxxyyyyR1eeeeSRCLI_0000.FIT' \
evlist='PxxxxxxyyyyR1eeeeEVENLI0000.FIT' \
xpsfbelow=95 xpsfabove=95 xpsfexcl=98
 
rgsspectrum evlist='PxxxxxxyyyyR1eeeeEVENLI0000.FIT' \
srclist='PxxxxxxyyyyR1eeeeSRCLI_0000.FIT' \
bkgcorrect=yes 

as is written in the threads.
 
However I used to run the rgsproc as a whole, and not the 5 stages separately.
The parameters: xpsfbelom, xpsfabove, and apsfexcl, which are parameters of
rgsregions, are not parameters of rgsproc (I don't know why). I don't want to
run the 5 stages separately. How can I enlarge the extraction region with
running the rgsproc ? 
 
Thank you a lot,
Doron.


Reply 1

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From: Rosario Gonzalez Riestra <xmmhelp@xmm.vilspa.esa.es>
To: doronl@wise1.tau.ac.il
Subject: Re: rgsproc task / enlarging the extraction region. (PR#15246)
Date: Thu Jul  1 08:02:05 2004

Dear Doron,

> 1)  I understood that in order to enlarge the extraction region of the
> cross-dispersion I need to enlarge the percentage of the cross-dispersion
PSF.
I
> do it by changing the following parameters: xpsfbelow, xpsfabove, and
xpsfexcl.
> I know the size of of my extended source and I look for an easy way of
> converting the angular size of it, let us say 2 arcmin, to the percentage
of
the
> cross-dispersion PSF. I don't want to 'try and check'. It is important to
> mention that my source is weak, so I can't see it in the plot. How can I
convert
> it from angular size to the percentage of the cross-dispersion PSF ?
 
I am afraid that there is not any straightforward way to estimate the percent of
the PSF in terms of spatial extension. I can only tell you that 90% corresponds
roughly to 1 arcmin and 97% to 2 arcmin, but you have to take into account that
the width of the PSF depends on the wavelength, i.e. it is narrower for longer
wavelengths.

> 2) In order to enlarge the extraction region I need to write the following
> commands:
> rgsregions srclist='PxxxxxxyyyyR1eeeeSRCLI_0000.FIT' \
> evlist='PxxxxxxyyyyR1eeeeEVENLI0000.FIT' \
> xpsfbelow=95 xpsfabove=95 xpsfexcl=98
>  
> rgsspectrum evlist='PxxxxxxyyyyR1eeeeEVENLI0000.FIT' \
> srclist='PxxxxxxyyyyR1eeeeSRCLI_0000.FIT' \
> bkgcorrect=yes 
>
> as is written in the threads.
> 
> However I used to run the rgsproc as a whole, and not the 5 stages
separately.
> The parameters: xpsfbelom, xpsfabove, and apsfexcl, which are parameters
of
> rgsregions, are not parameters of rgsproc (I don't know why). I don't want
to
> run the 5 stages separately. How can I enlarge the extraction region with
> running the rgsproc ? 
 
Please note that, unless you change the coordinates of the source you do not
need to 
run all the five stages of rgsproc, just to start in 'angles'.

The parameters that control the size of the extraction mask are in the 'spectra'
tab of rgsproc:

xpsfincl is equivalent to xpsfbelow and xpsfabove, assuming the same value for
both.
xpsfexcl is the limit for background computation (as in rgsregions).

You can change them and start rgsproc at the 'spectra' stage.

Hope this information is useful,


Regards


                 Rosario





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Date: Sun, 11 Jul 2004 13:57:47 +0300 (IDT)
From: Doron Lemze <doronl@wise1.tau.ac.il>
Subject: Re: rgsproc task / enlarging the extraction region. (PR#15246)
To: Rosario Gonzalez Riestra <xmmhelp@xmm.vilspa.esa.es>
Thank you very much for your quick, and clear answer.
Cheers,
Doron.


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