SKIP

     SKIP is a variable which determines the contour points or plot
     points to skip.  Input is entered as:

	skip_contour / skip_plot_x ; skip_plot_y

     The defaults for skip_contour and skip_plot are 0.

     Skip_contour thins the input grid before computing the 
     contours to be drawn.
     
     Skip_plot_x and _y specify the points at which data is to be
     displayed.  If skip_plot_x is positive and skip_plot_y is not 
     specified, skip_plot_y is set to skip_plot_x. 

     If skip_plot_x is negative, the x plot locations on alternate rows
     are indented by half the skip_plot_x value.  In this case, the 
     absolute value of skip_plot_x must be odd.  If not, the absolute 
     value minus 1 is used.  If no value for skip_plot_y is specified, 
     half the skip_plot_x value is used.

     Examples:

	SKIP	SKIP_CNTR	SKIP_PLOT_X	SKIP_PLOT_Y	STAGGER

	' '		0		 0		0	no
	2		2		 0		0	no
	-1		0		 0		0	no
	2;3		2		 0		0	no

	/3		0		 3		3	no
	/2;3		0		 2		3	no
	/;1		0		 0		1	no

	/-1		0		 1		0	yes
	/-3		0		 3		1	yes
	/-1;1		0		 1		1	yes


     Winds may be thinned by latitude by setting skip_plot_y to
     a negative value.  This feature is most useful when plotting 
     winds on a cylindrical grid on a projection with converging meridians.
     In this case, ABS(skip_plot_y) determines how often
     rows are plotted.  The variable skip_plot_x is not used.

     Examples:

	SKIP	SKIP_CNTR	SKIP_PLOT_X	SKIP_PLOT_Y	LAT THIN
	/1;-1		0		 1		1	yes
	-- every row is plotted with winds thinned along each row.

	/1;-2		0		 1		2	yes
	-- every other row is plotted with winds thinned.