/** first one has a few hundreds of obs. and a trend chart **/
gunit=pct border cback=white ftext=swissb htitle=6 htext=3
colors=(blue green red);
symbol2 value=star color=green;
value test 1 ='Meet'
0 ='Does not Meet';
proc gplot data=safe;
plot J*K=z /hm=5;
format z test.;
/*** the second one is just a line cross the chart with only a few obs */
1. Turn the second dataset (with the simple line) into an annotation dataset and pass it into the first GPLOT.
2. Assuming the variable names are unique between the two datasets, you can directly merge the two datasets and use the OVERLAY option in GPLOT.