The following message also appears in the SAS log:
WARNING: A blank graph is produced. For possible causes, see the graphics
template language documentation.
A REFERENCELINE statement can be used only within 2-D overlay-type layouts
(OVERLAY, OVERLAYEQUATED, or PROTOTYPE) with a stand-alone plot
statement. (See “REFERENCELINE Statement” in SAS Graph Template Language:
Reference.) The stand-alone plot statement must provide an axis data range that is
sufficient for determining the reference line axis extents. In this example, a stand-alone
plot is not provided in the REFERENCELINE statement’s layout. ...
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