NAME:
	fxtm
 PURPOSE: (one line)
	Fix bad time codes from Anderson Mesa CCD software.
 DESCRIPTION:
	This is a special purpose routine for fixing bad times that are
	generated from using MGO with the Hendon CCD control software at
	Anderson Mesa.  For a string of times, this is what it looks like:
	Frame      Stored time      Actual time
         n           t(n+1)          t(n)
	  n+1         t(n+2)          t(n+1)
	  n+2         t(n+3)          t(n+2)
	  n+3         t(n+3)          t(n+3)
	for a four frame sequence.  The times for n to n+2 are actually the
	times for the next frame, the n+3 time is correct.   The time for
	the first frame is lost.

	This program copies the times that are out of place and computes
	the first time by backing up from the n+1 frame by the mean of the
	difference between all the other frames.
 CATEGORY:
	CCD data processing
 CALLING SEQUENCE:
 INPUTS:
	vec - Time vector to be repaired (MODIFIED).
	i1  - First point in sequence within the vector.
	i2  - Last point in sequence within the vector.
 OPTIONAL INPUT PARAMETERS:
 KEYWORD PARAMETERS:
 OUTPUTS:
	vec - Time vector with i1 to i2 points repaired.
 COMMON BLOCKS:
 SIDE EFFECTS:
 RESTRICTIONS:
 PROCEDURE:
 MODIFICATION HISTORY:
	Written 1992 Jan 28, by Marc W. Buie, Lowell Observatory