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From: piero.ranalli2@studio.unibo.it
Subject: RGS vs MOS's coordinates
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Date: Wed, 10 Nov 2004 11:11:37 GMT
From: piero.ranalli2@studio.unibo.it
To: xmmhelp@xmm.vilspa.esa.es
CC: piero.ranalli2@studio.unibo.it
Subject: RGS vs MOS's coordinates
Full_Name: Piero Ranalli
Submission from: (NULL) (137.204.65.127)


Dear Helpdesk,

I'm somewhat confused about the relation between the RGS coordinates
(DELTA_CORR,
XDSP_CORR) and the MOS DETX/Y ones.  So far, I know that for RGS2-MOS2,
DELTA_CORR is parallel to DETX and XDSP_CORR is parallel to DETY. 

What about RGS1-MOS1? I've realized that the MOS1-DETX/Y are rotated with
respect to MOS2-DETX/Y. Does this apply to RGS1 also?


cheers

Piero Ranalli


Reply 1

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From: Maria Santos-Lleo <xmmhelp@xmm.vilspa.esa.es>
To: piero.ranalli2@studio.unibo.it
Subject: Re: RGS vs MOS's coordinates (PR#16566)
Date: Wed Nov 10 17:55:22 2004
Dear Piero, 

with regard to your question:

> I've realized that the MOS1-DETX/Y are rotated with
> respect to MOS2-DETX/Y. Does this apply to RGS1 also?
> 

no, RGS1 and RGS2 are not rotated one to the other, rather they 
have the same orientation

hope this helps you, 

Cheers

Maria
Maria Santos-Lleo, 
XMM-Newton SOC 
User Support Group


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Date: Thu, 11 Nov 2004 11:26:10 +0100
From: Piero Ranalli <piero.ranalli2@studio.unibo.it>
Subject: Re: RGS vs MOS's coordinates (PR#16566)
To: Maria Santos-Lleo <xmmhelp@xmm.vilspa.esa.es>
On Wednesday 10 November 2004 18:55, Maria Santos-Lleo wrote:
> with regard to your question:
> > I've realized that the MOS1-DETX/Y are rotated with
> > respect to MOS2-DETX/Y. Does this apply to RGS1 also?
>
> no, RGS1 and RGS2 are not rotated one to the other, rather they
> have the same orientation
>
> hope this helps you,
>

Dear Maria,

yes, this answers my question. Thus I'll take MOS1-DETX // RGS1_XDSP and 
MOS1-DETY // RGS2_DELTACORR.

May I make a suggestion, too?  I could not find, in the xmm user handbook, a 
description of the relationships between MOS DETXY and RGS coordinates.  
Maybe it was just me that was not able to find the right page. But, if this 
information is truly absent, it would be nice if it could be added in the 
next UHB release.

Many thanks,

Piero Ranalli



Reply 2

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From: Maria Santos-Lleo <xmmhelp@xmm.vilspa.esa.es>
To: piero.ranalli2@studio.unibo.it
Subject: Re: RGS vs MOS's coordinates (PR#16566)
Date: Fri Nov 12 10:25:18 2004
Dear Piero, 

I am happy to hear that your question was solved and thanks for your 
suggestion to improve our documentation, they are always welcome !

There are a couple of figures in the current version of the User 
Handbook which show the MOS DETX/DETY axes together with the RGS 
dispersion direction. There is also a similar one for one for pn.
They are Figs. 20, 21 and 22, can be found at:

http://xmm.vilspa.esa.es/external/xmm_user_support/documentation/uhb/node26.html

and, for pn, :

http://xmm.vilspa.esa.es/external/xmm_user_support/documentation/uhb/node27.html

I think this is more or less what you were looking for. 

With best regards

Maria

Maria Santos-Lleo, 
XMM-Newton SOC 
User Support Group


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Date: Fri, 12 Nov 2004 14:20:48 +0100
From: Piero Ranalli <piero.ranalli2@studio.unibo.it>
Subject: Re: RGS vs MOS's coordinates (PR#16566)
To: Maria Santos-Lleo <xmmhelp@xmm.vilspa.esa.es>
On Friday 12 November 2004 11:25, Maria Santos-Lleo wrote:
> I think this is more or less what you were looking for.

Yes, it is. Again, thank you very much.

Cheers

Piero


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