about dispersion axis

Francisco Valdes wrote on Jan 10, 2006

From: "Janaka Adassuriya" <adassuriya@accmt.ac.lk ([email]adassuriya@accmt.ac.lk[/email])>
Date: January 9, 2006 3:50:24 AM MST
To: "Frank Valdes" <valdes@noao.edu ([email]valdes@noao.edu[/email])>
Subject: about dispersion axis

Dear Frank,
 
I have a problem on dispersion axis of a spectrum. In kpnoslit package there is a parameter called dispaix.
Off this parameter
 
1-  means line
2 - means columns
 
And there is a another parameter in apall, called line.
 
I am confusing about these lines. My spectrum is a horizontal one as shown in DS9 terminal. Could you please tell me if I want to do the wavelength calibration what should I put for above parameters. Thanks
 
Janaka
Research Scientist
Arthur C Clarke Institute
Sri Lanka

From: Frank Valdes <valdes@noao.edu ([email]valdes@noao.edu[/email])>
Date: January 9, 2006 8:53:33 AM MST
To: Janaka Adassuriya <adassuriya@accmt.ac.lk ([email]adassuriya@accmt.ac.lk[/email])>
Subject: Re: about dispersion axis

Dear Janaka,
The "line" parameter in apall refers to the line or column which crosses the dispersion axis at which display (as in the aperture editing) and tracing starts.

So if dispaxis = 1 the the line parameter is the column for aperture editing and for tracing to start.

Yours,
Frank

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