Comparison of Band 1 images:
IRAC.1.0000000001.0002.0000.10.mipl.flat.fits (a.k.a. image1)
IRAC.1.0000000001.0005.0000.10.mipl.flat.fits (a.k.a. image2)
which overlap by 1/2 of the image.

In that overlap area (roughly 128X256 pixels)

The truth image has  37 stars brighter than 13.0th mag
The truth image has  81 stars brighter than 13.5th mag
The truth image has 149 stars brighter than 14.0th mag
The truth image has 263 stars brighter than 14.5th mag
The truth image has 443 stars brighter than 15.0th mag
The truth image has 672 stars brighter than 15.5th mag
The truth image has 2214 stars fainter than 15.5th mag

DAOPHOT found 1022 stars in the overlap area of image1.
DAOPHOT found 1000 stars in the overlap area of image2.

Comparing those 2 lists 816 stars agree 1-to-1 within a 0.75 pixel
radius.  There were 15 occurances where one list listed 2 stars
while the other list had only 1 star, however the combined fluxes
in these disputed areas agreed.  Of these 15 occurances when compared
to the truth list all but 2 of those areas actually had 2 or more
stars in a 1.5 pixel radius.

NOTE:
When comparing output from DAOPHOT lists, stars were matched
when their positions agreed to within a radius of 0.75 pixels.
When comparing the DAOPHOT list with the truth list a match
was defined by a larger 1.5 pixel radius do to the inaccuracy
of the truth list positions produced by Ashby's conversion of
spatial coordinates.

Finally a listing of completeness and reliability for these images

image 1
      # of *'s  matched *'s            # of false
Mag   in truth  by DAOPHOT  %Complete    stars     %Reliability
----  --------  ----------  ---------  ----------  ------------
13.0    37         37         100.0%      0         100.0%
13.5    81         80          98.8%      1          98.8%
14.0   149        148          99.3%      5          96.7%
14.5   263        260          98.8%      8          97.0%
15.0   443        434          98.0%     11          97.5%
15.5   672        650          96.7%     12          98.2%

image 2
      # of *'s  matched *'s            # of false
Mag   in truth  by DAOPHOT  %Complete    stars     %Reliability
----  --------  ----------  ---------  ----------  ------------
13.0    37         37         100.0%      0         100.0%
13.5    81         81         100.0%      0         100.0%
14.0   149        148          99.3%      1          99.3%
14.5   263        258          98.1%      1          99.6%
15.0   443        433          97.7%      1          99.8%
15.5   672        652          97.0%      3          99.5%


Only stars found by DAOPHOT in both image1 and image2
      # of *'s  matched *'s            # of false
Mag   in truth  by DAOPHOT  %Complete    stars     %Reliability
----  --------  ----------  ---------  ----------  ------------
13.0    37         37         100.0%      0         100.0%
13.5    81         80          98.8%      0         100.0%
14.0   149        147          98.6%      0         100.0%
14.5   263        256          97.3%      0         100.0%
15.0   443        424          95.7%      0         100.0%
15.5   672        636          94.6%      0         100.0%


Typical errors are less than 0.2 magnitudes for stars less than 16th magnitude.

NOTE:
Since the truth list extends down to 20th magnitude, and DAOPHOT
cannot detect stars that faint, when multiple truth image stars fall
within the 1.5 pixel radius of a detected DAOPHOT source, all flux of
all stars within that radius are coadded and compared to the
detected source.  On occasion there may also be more than one DAOPHOT
detected source within the 1.5 pixel radius, those detected sources were
also coadded.  For completeness any DAOPHOT source within 1.5
pixels of the truth image star was considered a match.  For reliability
false stars were defined as stars only in the DAOPHOT list which had
no truth image star within a 1.5 pixel radius, or in cases were
DAOPHOT produced multiple stars within a 1.5 pixel radius and the
matched truth images stars totalled less than the DAOPHOT number of
stars.  If the truth image had multiple stars within the 1.5 pixel radius
of a single DAOPHOT star, the match is considered reliable, the stars in
the truth image are simply considered unresolvable.

NOTE:
These images contain no saturated stars.