Use the TEMPLATE procedure to customize the appearance of your SAS output.

proc template ;
   define statgraph damping;
   dynamic X AMP FREQ;
   begingraph;
       entrytitle "Damped Harmonic Oscillation";
       layout overlay / yaxisopts=(label="Displacement");
          if (exists(X) and exists(AMP) and exists(FREQ)) 
	            bandplot x=X  limitlower=eval(-oscillateBound(X,AMP)) 
                limitupper=eval(oscillateBound(X,AMP));
                seriesplot x=X y=eval(oscillate(X,AMP,FREQ));
	      endif;
	    endlayout;
   endgraph;
   end;
   run;