[daip] LTESS question

[Lawrence Rudnick]

I must be doing something silly, but when I run LTESS on two (processed) 
images from the NVSS  (after first having hgeom'd them to a larger 
template that I want to place them on, and having the external areas 
magick blanked), it normalizes them by dividing by 2 everywhere, and 
then adding the maps together (so that the overlap region is higher than 
the non-overlap regions).  In other words, it is not averaging only in 
the overlap region, as it should.
If I put in noise values, it simply sums in the overlap region, and 
makes the values extremely high in the non-overlap region.
suggestions?
(31DEC06 version).        thanks.  lr



AIPS 4: LTESS :  Task do make linear combination mosaics
AIPS 4: Adverbs     Values                 Comments
AIPS 4: ----------------------------------------------------------------
AIPS 4:                                    Input image
AIPS 4: INNAME     'BIGCOMA'                  Image name (name)
AIPS 4: INCLASS    'CVP800'                   Image name (class)
AIPS 4: INSEQ         1                       Image name (seq. #)
AIPS 4: INDISK        4                       Image disk drive #
AIPS 4:                                    Output  image
AIPS 4: OUTNAME    'BIGCOMA'                  Image name (name)
AIPS 4: OUTCLASS   ' '                        Image name (class)
AIPS 4: OUTSEQ        0                       Image name (seq. #)
AIPS 4: OUTDISK       4                       Image disk drive #
AIPS 4:
AIPS 4: NMAPS         2                    Number of maps to analyse
AIPS 4: NOISE      *all 0                  Image noise, units are
AIPS 4:                                    (Jy/BEAM)
AIPS 4: BLC        *all 0                  Bottom left corner of LTESS
AIPS 4: TRC        *all 0                  Top right corner of LTESS
AIPS 4: PBSIZE       -1          -1        PB FWHM in arcseconds:
AIPS 4:              -1          -1        < 0 - no PB correction
AIPS 4: ** press RETURN for more, enter Q or next line to quit print **
#
AIPS 4:              -1          -1        = 0 - use PBPARM
AIPS 4:              -1          -1        > 0 - use Gaussian
AIPS 4:              -1          -1          -1          -1
AIPS 4:              -1          -1          -1          -1
AIPS 4:              -1          -1          -1          -1
AIPS 4:              -1          -1          -1          -1
AIPS 4:              -1          -1          -1          -1
AIPS 4:              -1          -1          -1          -1
AIPS 4:              -1          -1          -1          -1
AIPS 4:              -1          -1          -1          -1
AIPS 4:              -1          -1          -1          -1
AIPS 4:              -1          -1          -1          -1
AIPS 4:              -1          -1          -1          -1
AIPS 4:              -1          -1          -1          -1
AIPS 4:              -1          -1          -1          -1
AIPS 4:              -1          -1          -1          -1
AIPS 4: PBPARM     *all 0                  Beam parameters:
AIPS 4:                                    (1) Cutoff 0 -> 0.07
AIPS 4:                                    (2) > 0 -> Use (3)-(7)
AIPS 4:                                    (3)-(7) Beam shape
AIPS 4: BADDISK    *all 0                  Disks to avoid for scratch.