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      SUBROUTINE slCRAF (NDP, ANGLE, SIGN, IDMSF)

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      C R A F
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  Convert an angle in radians into degrees, arcminutes, arcseconds
  (single precision)

  Given:
     NDP       int      number of decimal places of arcseconds
     ANGLE     real     angle in radians

  Returned:
     SIGN      char     '+' or '-'
     IDMSF     int(4)   degrees, arcminutes, arcseconds, fraction

  Notes:

     1)  NDP less than zero is interpreted as zero.

     2)  The largest useful value for NDP is determined by the size of
         ANGLE, the format of REAL floating-point numbers on the target
         machine, and the risk of overflowing IDMSF(4).  For example,
         on the VAX, for ANGLE up to 2pi, the available floating-point
         precision corresponds roughly to NDP=3.  This is well below
         the ultimate limit of NDP=9 set by the capacity of the 32-bit
         integer IHMSF(4).

     3)  The absolute value of ANGLE may exceed 2pi.  In cases where it
         does not, it is up to the caller to test for and handle the
         case where ANGLE is very nearly 2pi and rounds up to 360 deg,
         by testing for IDMSF(1)=360 and setting IDMSF(1-4) to zero.

  Called:  slCDTF

  P.T.Wallace   Starlink   18 March 1999

  Copyright (C) 1999 Rutherford Appleton Laboratory
  Copyright (C) 1995 Association of Universities for Research in Astronomy Inc.

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