Dereddend DR7 spectra:

Pat has applied the dereddening on DR7 except the 218 objects added by me.

I have changed the permissions of the objects in plates:

2352, 0733,0734,0736,0737,0739

Here is what Pat has done. I will follow him:

" the best way to proceed is to rerun the reconstruction
on dereddened spectra.  Now, earlier I mentioned that the extinction curve
that's probably best is that of Fitzpatrick, E. L., 1999, PASP 111, 63.
But Yip et al used O'Donnell and CCM; I don't know the O'Donnell reference
but CCM is Cardelli,  Clayton,  and  Mathis,  ApJ  345:245,  1989.

The difference between extinction laws is small in the optical, and the
extinction corrections are small at the high Galactic latitudes of the SDSS.
Small differences to small corrections are not a big deal, so I think the
best thing to do about dereddening is the quickest thing.  That's to use
the IRAF task "deredden" which has the CCM law built-in.  I've run it on
all the spectra on canis that I can, so there are now dereddened versions
of almost all the spectra ready to go, including the duplicate spectra.
(It turns out that all the duplicate spectra of DR7 quasars were already
on canis.)

The only objects which I wasn't able to deredden are the 218 objects whose
spectra you added to canis, because only you have permission to read those
spectra.  To deredden those objects yourself, start IRAF, type "noao" and
"onedspec" to load packages, cd /data/phall/WILD/SKYSUB/ and type:
        cl < finishDR7dered.cl
...and then change the permissions on the original and deredenned spectra
so that everyone has read and execute permission on them.

The dereddened spectra are in the same directories, with "DR" appended
to their names.  That is, you should reconstruct
2152/spSpec-53874-2152-162_skysubDR.fit
instead of
2152/spSpec-53874-2152-162_skysub.fit"