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      Print the tag values of an array of structures in nice column format.


      The tag names are displayed in a header line.

Calling Sequence

      print_struct, structure, Tags_to_print [ , title, string_matrix
                FILE=, LUN_OUT=, TNUMS= , TRANGE= , FRANGE=, WHICH=
                FORM_FLOAT =, MAX_ELEMENTS


      structure = array of structured variables
      Tags_to_print = string array specifying the names of tags to print.
                      Default is to print all tags which are not arrays.

Optional Input Keywords

      FILE = string, optional file name to which output will then be written.
      LUN_OUT = Logical unit number for output to an open file,
              default is to print to standard output.
      TNUMS = tag numbers to print (alternative to specifying tag names).
      TRANGE = [beg,end] tag number range to print.
      FRANGE = same as TRANGE.
      WHICH = optional array of subscripts to select
              which structure elements to print.
      FORM_FLOAT = string array of three elements specifying
              floating point format, ex: FORM=['f','9','2'] means "(F9.2)",
              (default float format is G12.4).
      MAX_ELEMENTS = positive integer, print only tags that have less than
                      this number of elements (default is no screening).
      /NO_TITLE - If set, then the header line of tag names is not printed
      /STRINGS : instead of printing, return the array of strings in
              fourth argument of procedure: string_matrix.


      title = optional string, list of tags printed/processed.
      string_matrix = optional output of string matrix of tag values,
                      instead of printing to terminal or file, if /STRINGS.


      Check the types and lengths of fields to decide formats,
      then loop and form text string from requested fields, then print.


      Written: Frank Varosi NASA/GSFC 1991.
      F.V.1993, fixed up the print formats.
      F.V.1994, added more keyword options.
      F.V.1997, added WHICH and MAX_ELEM keyword options.
      WBL 1997, Use UNIQ() rather than UNIQUE function
      Remove call to N_STRUCT() W. Landsman March 2004
      Avoid overflow with more than 10000 elements W. Landsman Nov 2005
      Really remove call to N_STRUCT() W. Landsman July 2009

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