iraf.net

---------- Forwarded message ----------
Date: Tue, 16 Aug 2005 10:37:34 +0200 (CEST)
From: Andreas Koch <koch@astro.unibas.ch>
To: Mike Fitzpatrick <fitz@tucana.tuc.noao.edu>
Subject: Re: Question on sample bounds in "fxcor" Dear Mike,thank you for your help.
Using :show in fxcor I found out that the ranges apparently have to be
given like '60000000000000.0-...' in my case. CRVAL1 is angstrom, CUNIT is
missing. But since it works with this synthax, I haven't bothered any
further for the moment.Best wishes,
Andreas
On Mon, 15 Aug 2005, Mike Fitzpatrick wrote:> Hi Andreas,
> I apologize for the delay in replying to your mail. Unfortunately
> FXCOR is expecting the dispersion values to be in Angstroms but should do
> the conversion automatically anyway. The DISPTRANS task can be used to
> convert the units (see the help page) but note that 6000A is 6E-7 where
> your message indicates 6E13? Are you sure the units are meters? You
> should check the WCS keywords in the header to be sure that the values
> and units agree, i.e. the CRVAL1 may indeed be given in Angstroms but a
> CUNIT keyword may specify meters and so the wrong scaling is being
> applied.
> Feel free to send me a listing of the header if you're not sure
> what to look for. Note also the SLIST task is able to dump the dispersion
> information for the images in a format that may be easier to read. Hope
> this helps, let us know if you still have questions.
>
> Regards,
> Mike Fitzpatrick
>
>--
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