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CLIC\MODIFY FOCUS [antenna1 value1 antenna2 value2 ...]
Correct the phases for the offsets in focus, introduced to optimize ef-
ficiency. antenna1 is the antenna number, value1 the focus offset in mm,
and so on. The phases are normally corrected in real time since
1996-nov-29. Between 1996-may-29 and 1996-nov-29, the focus corrections
were logged in the data files. Before 1996-may-29 they are only in the
log-obs files. Between 1996-nov-29 and 1998-apr-02, the correction had
wrong sign for the few projects using HIGH LOCK.
So use MODIFY FOCUS with NO arguments for data more recent that
1996-nov-29: this should correct the HIGH LOCK problem. Between
1996-may-29 and 1996-nov-29, MODIFY FOCUS with no arguments will use the
focus offsets in the header and apply the corresponding phase offsets.
For older data you may now search for the focus changes in the log files
to apply the phase corrections before calibration; or use jumps in the
phase calibration (SOLVE PHASE /BREAK) just as you had done before.