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The apphot and daophot package aperture photometry tasks have been modified
to compute the aperture sums and areas in double precision instead of real
precision. This change minimizes machine precision errors that can become
significant for large apertures and very low noise or synthetic data.
These tasks have also been modified to output negative values of the total
flux should they occur. Formerly these values were being artificially set to
0.0. This change makes it easier to see the effects of any sky value and machine
errors.
The modified apertures photometry tasks are available under irafx. Let me
know if you have any questions about the modified tasks or encounter and
problems using them.
Lindsey Davis
davis@noao.edu
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