BOGUS NOTES

07.16.99

1.  Make a bias frame by averaging together the 10 or so 0 s 
    dark exposures.  Now proceed in two ways:

	a)  Subract the bias frame from the data, then run
	    two-amp on the output.

	b)  Run two-amp on the individual bias frames and on
	    the LRIS frames.  Average the two-amped bias frames,
	    and subtract them from the LRIS frames.
    
    Proceed with whichever results look better...  

    Note:  Two-amp trims automatically. (It knows the size of the
    LRIS overscan and prescan regions.)


2.  Make flat frame out of the internal flats.  DON'T RUN 
    RESPONSE!  (Bogus will do this later.)


3.  Generate the bogus input files.  You need:

	LIST.OBJ
        Make a list of just your object frames (no lamps or
	flats).

	LIST.SHIFT
	Make a shiftlist just as like those made when reducing
  	longslit data.  That is:
		a)  x-shift:  splot a sky line
		b)  y-shift:  apall a bright continuum
	You should do this from the center slit.
	
	LIST.SLITLET
	This file has 4 columns: 

		name bottom top skyline

	Get bottom/top by splotting the frames with the dispersion
	axis set to "2" (I think--vertically, anyway).  Then do
	:line 1024 and :nsum 2048 to sum the whole thing.  Cut with
	a 4-5 pixel margin.  Get the skyline location by splotting
	in the middle of each slit with the disperion axis set back 
	on "1", then use the 6300 skyline.

4.  Look at your 2Ds.  Mayhap you'll run BGS again!  Otherwise,
    extract as before.   (The lamps will be carved up appropriately.)