CLEANPLOT

       Reset all plotting system variables (!P,!X,!Y,!Z) to their default values

       Reset all system variables (!P,!X,!Y,!Z) which are set by the user
       and which affect plotting to their default values.

       Cleanplot, [ /Silent, /ShowOnly]

       None

       /SHOWONLY - If set, then CLEANPLOT will display the plotting system
                 variables with nondefault values, but it will not reset them.
       /SILENT - If set, then CLEANPLOT will not display a message giving the
                 the system variables tags being reset.    One cannot set
                  both /SILENT and /SHOWONLY

       None

       The system variables that concern plotting are reset to their default
       values.  A message is output for each variable changed.
       The !P.CLIP and CRANGE, S, WINDOW, and REGION fields of the
       !X, !Y, and !Z system variables are not checked since these are
       set by the graphics device and not by the user.

       This does NOT reset the plotting device.
       This does not change any system variables that don't control plotting.

       If user default values for !P, !X, !Y and !Z are different from
       the defaults adopted below, user should change P_old etc accordingly

       Written IDL Version 2.3.0  W. Landsman & K. Venkatakrishna May '92
       Handle new system variables in V3.0.0     W. Landsman   Dec 92
       Assume user has at least V3.0.0           W. Landsman   August 95
       V5.0 has 60 instead of 30 TICKV values    W. Landsman   Sep. 97
       Change !D.N_COLORS to !D.TABLE_SIZE for 24 bit displays
               W. Landsman  April 1998
       Added silent keyword to supress output & modified X_old to
       handle the new !X and !Y tags in IDL 5.4   S. Penton     July 2000
       Test for visual depth if > V5.1   W. Landsman     July 2000
       Macs can report a visual depth of 32  W. Landsman  March 2001
       Call device,get_visual_depth only for device which allow it
                W. Landsman  June 2001
       Default !P.color is 16777215 for 16 bit systems
                       W. Landsman/M. Hadfield   November 2001
       Added ShowOnly keyword   W. Landsman      April 2002

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