FXMOVE

     Skip a specified number of extensions in a FITS file

     STATUS=FXMOVE(UNIT, N_EXT, /Silent)

     UNIT     = An open unit descriptor for a FITS data stream.
     N_EXT   = Number of extensions to skip.

     /SILENT - If set, then any messages about invalid characters in the
               FITS file are suppressed.

     0 if successful.
    -1 if an error is encountered.

      None.

      Repositions the file pointer.

      Each FITS header is read in and parsed, and the file pointer is moved
      to where the next FITS extension header until the desired
      extension is reached.

      FXPAR(), MRD_HREAD, MRD_SKIP

      Extracted from FXPOSIT 8-March-2000 by T. McGlynn
      Added /SILENT keyword  14-Dec-2000 by W. Landsman
      Save time by not reading the full header  W. Landsman   Feb. 2003

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