There are three unwrapping algorithms available under CALIBRATEVISIBILITYTRIPLE. For the first two, REWRAPTRIPLE
and DEWRAPTRIPLE, you have to have calibrator stars selected
first, since they unwrap only the data for these stars (for the time
being). Rewrapping here shall mean the rotation of the complex visibility
by a specified angle so that the entire range of phases fits into
the interval degrees. The the phases are recomputed, and
backrotation is applied to the complex quantities, but merely subtracted
from the phases. If the phase is wrapping more rapidly, one should plot
the (calibrated) triple phase, and fit a low order polynomial to a stretch
which does not wrap (use FIT). The fit parameters are passed to the
unwrapping algorithm, which removes it from the data and then removes also
the resulting steps. The fit is then reapplied to the data. The manual
unwrapping utility, MANUALUNWRAP, will allow the user to place a
box into a plot of phase vs time or channel, and the data inside will be
rotated
or
degrees, as specified. No calibrator stars need
be specified for this operation. Note that in this case the calibrated
phase has to be plotted, since this is the phase which is unwrapped!