%% auteur : 

-2 4 setxrange
-1 4 setyrange
40 setxunit
40 setyunit
1 1 setquadrillagestep
quadrillage

currentlinewidth 2 mul setlinewidth
tracerepere
marks

1.5 setlinewidth

0 2.7 1 2.7 droite   %% D2
setTimesItalic
(b) 0 2.7 [1.5 1.5] ltext
#latex#$D:y=b$
2 3 [1.5 1.5] crtexlabel