The procedures described above (Section 2.2.2) can also be used to
minimise transients during concatenated chains of similar
observations. For example, consider the case of an observation in
which the same ISOCAM configuration is used to observe several objects
in a concatenated chain. Unless the special values of the DRK
parameter are used, the instrument will go into parallel mode between
each two successive observations in the chain. In that case, the
observer would need stabilisation time to recover from the flux
transient due to the change in configuration from the observing set-up
to parallel mode and then back to the observing mode again. This can
be avoided by using DRK=19 at the end of the first AOT, using DRK=29
in all of the intermediate steps, and using DRK=20 in the last AOT of
the chain. Note that if the observer only uses ONE filter in the
concatenated chain he or she will only have to stabilise the array in
the first AOT. Nstab for all others can be set to 4.
When using this option, the user should be careful to insure that none of
his observations will saturate. If the first or last source in the chain is
brighter than about 0.6 Jy, dummy pointings at the beginning and end of the
chain may also be needed.