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% --- start of displayed preamble in the book ---
input graph
def sq(expr x,y,num,perc) =
gfill(x,y)--(x+10,y)--(x+10,y+10)--(x,y+10)--cycle
withcolor (perc/100,perc/100,perc/100);
glabel(num,(x+5,y+5)) if perc < 50: withcolor white fi;
enddef;
% --- end of displayed preamble in the book ---
defaultfont:="ptmr8r";
warningcheck:=0;
beginfig(1)
defaultscale:=0.7;
draw begingraph(70mm,24mm);
setrange((20,10),(110,40));
autogrid(,);
gdata ("pot.dat",c,
sq((scantokens c1)*10,(scantokens c2)*10, c3, (scantokens c4)););
endgraph;
endfig;
end;
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