This procedure is used to list the currently defined variables
that do not reference files or HLU objects.
procedure list_vars( )
Lists all of the currently defined variables, their types, and
their dimensionality. If run at the command line, this procedure
invokes a pager for scrolling through the list. The pager is either
"more" or whatever the user's PAGER environment
variable is set to.
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$Revision: 1.9 $ $Date: 1998/06/15 21:30:08 $