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Colors and line styles are assigned differently beginning in Release 8.2
of SAS/GRAPH.  If the LVREF/LHREF or CVREF/CHREF options are specified
without parentheses, the option is applied to all of the
vertical/horizontal reference lines, not just the ones specified with
the VREF/HREF option.  For example:

  PROC GPLOT;
    PLOT Y*X / VREF=1 GRID LVREF=3 CVREF=RED;

The output that is produced from the above example will have a vertical
reference line at 1 which is red, with a line style of 3.  The other
vertical lines which are produced by the GRID option will also be red
with a line style of 3.

If you only want the reference lines that have been specified with the
VREF/HREF options to be affected, you need to specify the LVREF/LHREF
and CVREF/CHREF option values in parentheses.  For example:

  PROC GPLOT;
    PLOT Y*X / VREF=1 GRID LVREF=(3) CVREF=(RED);

The output produced by this example will have a red vertical reference
line with a line style of 3.  The rest of the vertical lines produced
from the GRID option will use the default color and line style.

Operating System and Release Information