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      REAL FUNCTION slRA1P (ANGLE)

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      R A 1 P
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  Normalize angle into range +/- pi  (single precision)

  Given:
     ANGLE     dp      the angle in radians

  The result is ANGLE expressed in the +/- pi (single
  precision).

  P.T.Wallace   Starlink   23 November 1995

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

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