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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;
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