Re: Disk 17 FITS headers

[Doug Welch <welch@physics.mcmaster.ca>]

It is really not so important that it looks good. What is important
is how reproducible it is (i.e. how well it flattens image frames).
Is there any indication that this flat won't be up to that task?
(Another relevant question is: What is the percentage difference
in response between the "spots" and the rest of the field?)

Cheers,
Doug

On Sun, 8 Apr 2001, Tom Droege wrote:
>
> I just looked at the I band flat made with 36 object frames.  There are 
> several big spots and a bad line.  These are the most abused CCDs.   I have 
> tried to do most of the development on one set of CCDs.  So these have 
> gotten dirty from times that the covers have come off, etc..  I have kept 
> the last 20 new ones "virgin" so eventually there will be some clean cameras.
> 
> Tom Droege
>