Comparison of Band 2 images:
IRAC.2.0000000001.0010.0000.10.mipl.flat.fits (a.k.a. image1)
IRAC.2.0000000001.0013.0000.10.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  52 stars brighter than 13.0th mag
The truth image has  98 stars brighter than 13.5th mag
The truth image has 203 stars brighter than 14.0th mag
The truth image has 345 stars brighter than 14.5th mag
The truth image has 558 stars brighter than 15.0th mag
The truth image has 834 stars brighter than 15.5th mag
The truth image has 2282 stars fainter than 15.5th mag

DAOPHOT found 953 stars in the overlap area of image1.
DAOPHOT found 934 stars in the overlap area of image2.

Comparing the 2 DAOPHOT lists 717 stars agree 1-to-1 within a 0.75 pixel
radius.  There were 13 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    52         52         100.0%      0         100.0%
13.5    98         98         100.0%      1          99.0%
14.0   203        200          98.5%      1          99.5%
14.5   345        339          98.3%      2          99.4%
15.0   558        542          97.1%      4          99.3%
15.5   834        774          92.8%      8          99.0%

image 2
      # of *'s  matched *'s            # of false
Mag   in truth  by DAOPHOT  %Complete    stars     %Reliability
----  --------  ----------  ---------  ----------  ------------
13.0    52         52         100.0%      0         100.0%
13.5    98         97          99.0%      2          98.0%
14.0   203        202          99.5%      6          97.1%
14.5   345        339          98.3%      6          98.3%
15.0   558        541          97.0%     12          97.8%
15.5   834        772          92.6%     15          98.1%


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    52         52         100.0%      0         100.0%
13.5    98         95          96.7%      0         100.0%
14.0   203        193          95.1%      0         100.0%
14.5   345        320          92.8%      0         100.0%
15.0   558        504          90.3%      2          99.6%
15.5   834        694          83.2%      3          99.6%


Typical errors are less than 0.2 magnitudes for stars less than 15.5th 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.