; KEYVALUE
;---------------------------------------------------------------
;! gives contents of numeric-valued keyword parameter
;# ADVERB CATALOG
;-----------------------------------------------------------------------
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;-----------------------------------------------------------------------
;---------------------------------------------------------------
KEYVALUE  LLLLLLLLLLLLUUUUUUUUUUUU CCCCCCCCCCCCCCCCCCCCCCCCCCCCC
----------------------------------------------------------------
KEYVALUE
Type: Adverb    (array(2))
Use:  To specify the value of a numeric-valued keyword
      parameter.  The value is KEYVALUE(1) + KEYVALUE(2) after
      both are separately converted to double precision.  This
      allows the user to specify a higher precision number.
      If KEYVALUE(2) = KEYVALUE(1), then the value is taken to
      be just KEYVALUE(1).
Null value:   none.
Verbs:
   EGETHEAD....Returns parameter value from image header and error code.
   GETHEAD.....Gets a parameter value from the header field described by
               the FITS keyword in adverb KEYWORD.
   GETTHEAD....Returns keyword values from a table header, also column
               #, # rows
   PUTHEAD.....Puts a new value in the header field described by the
               FITS keyword in adverb KEYWORD.  There is no default for
               KEYVALUE.
   PUTTHEAD....Inserts a given value into a table keyword/value pair.
   TABGET......Returns table entry for specified row, column and
               subscript.
   TABPUT......Replaces table entry for specified row, column and
               subscript.
Tasks:
   CCFND.......
   PRTCC.......
   TABED.......Task to edit tables.  KEYVALUE is the value given to a
               numeric-valued parameter.
   TACOP.......Task to copy tables, other extension files.  To copy a
               table, KEYVALUE gives an allowed range for a
               numeric-valued KEYWORD.
   VLBIN.......
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