All slit mask files must be submitted at least 6 weeks in advance of an observing run.

Frank Perez must give permission for files to be submitted between 3-6 weeks before a run. We cannot guarantee that masks will be cut in this interval.

NO masks will be cut less than 3 weeks before the deadline.

The following summarizes the FAILURE rate of meeting the old policy (submitting mask files at least 28 days in advance).

In addition to this policy, observers should always verify that their program has the correct f/ratio (IMACS/2 or IMACS/4) for their program. The Observatory works hard to block schedule IMACS to avoid frequent changes between f/ratios.