From lemaire@medoc-ias.u-psud.fr Tue Nov 18 16:43:41 2003
Date: Tue, 6 Apr 1999 11:46:20 +0200 (MET DST)
From: Philippe Lemaire <lemaire@medoc-ias.u-psud.fr>
Reply-To: sumer-soft@esa.nascom.nasa.gov
To: sumer-soft@esa.nascom.nasa.gov
Subject: Re: SUMER-SOFT: Update of ft_sumread_fits for .FTS files generated
    from CD_ROM

To: SUMER Data Users
From:  Philippe Lemaire, IAS

Subject: Update of ft_sumread_fits for .FTS files generated from CD_ROM

Dear colleagues,


I have discovered an error in the binary header given the location of the Y_reference pixel when a 
small slit (1 x 120  or 0.3 x 120 arcsec^2, up or down) is used with format giving 120 pixels along 
the slit. 
As stated for the FTS files the data are well aligned along solar Y_axis (north: top, South: bottom, 
of the 120 pixels dimension), but the reference y_pixel has not been moved on the Y_axis of the 
detector.
 While I have not the capability to modify the header, I have made the modification in 
 ft_sumread_fits and create a new temporary modified header valid during the IDL session. So, as soon 
as you use ft_sumread_fits, the Y_reference pixel read in the header is at its true location (critical 
before applying Flatfield and Destretching functions).
 The new ft_sumread_fits function is now the one in sumer-soft tree. The change is transparent for the 
user.
 
 With best regards,
 
 Philippe Lemaire