Script command to obtain a flatfield image through the Fabry-Perot
system. This script cycles through an entire free spectral range of
the etalon, integrating the CCD at a large number of specific etalon
spacings. Such a procedure is necessary due to the fact that the
etalon modulates the incoming light with its wavelength-dependent
instrumental profile, removing its ``white'' nature. The
@fpeon script is a simplified version of @fpflat.
Images taken with the @fpflat script are ultimately obtained
using the keep command and will therefore be given image names
beginning with the letter `k'. Be sure to check the resulting flats
to make sure that they contain sufficient flux, but are not
saturated.
