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HEADERS
Description : This
task will use the ut, date, exposure, ra, dec,
ha, and epoch
parameters, to calculate and add to your headers the
mid-observation
UT (utmid), the sidereal time (ost), effective
airmass (wairmass),
and Julian Date (jd).
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Parameters
for "headers"
Do an epar on headers and you will get: 
Make sure that the new parameters make sense. In particular, check
that the new airmass is close to the original
airmass, and that the julian date is
correct.
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