You'll need to merge the data into "long forn": an ID variable that identifies the three groups, a T variable that contains the stacked times, and a Y variable that contains the stacked Y1, Y2, and Y1-Y2. Then use PROC SGPANEL to plot the three graphs on a common XAXIS.
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ANOVA, or Analysis Of Variance, is used to compare the averages or means of two or more populations to better understand how they differ. Watch this tutorial for more.