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+% --- start of displayed preamble in the book ---
+input graph
+% --- end of displayed preamble in the book ---
+defaultfont:="ptmr8r";
+warningcheck:=0;
+beginfig(1)
+path s; numeric x,y;
+draw begingraph(2.5in,1.75in);
+gdata ("students.dat",c,
+ x:=(scantokens c1) * 12;
+ y:=(scantokens c2);
+ augment.s((x-5,0)--
+ (x-5,y)-- (x+5,y)--
+ (x+5,0));
+ if y < 0: glabel.top(c2,(x,0)); fi
+ if y > 0: glabel.bot(c2,(x,0)); fi
+);
+gfill s--cycle withcolor .5white;
+frame.llft;
+endgraph;
+endfig;
+end;