-1 4 setxrange
-1 3 setyrange
200 setwidth
160 setheight
/M {3 2} def
18 setfontsize
traceaxes
axesarrow
unites
1 setlinewidth
O M (->) line
[O M] ligne
M point
pointilles
[M projy M M projx] ligne
setTimesItalic
(O) O dltext
(M) M urtext
(a) M projx dctext
(b) M projy bltext
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