28.45 setxunit
%7.5 setborder
90 setangle_repere
-0.5 20 setxrange
-1 6 setyrange
1 setxtkstep
0.5 setxsubtkstep
/xmarkstyle {[1.5 dup] dctext} def
traceOx
axeOxarrow
xticks
xsubticks
xmarks
0 xmark
/t {2} def
/a {2} def
/b {a 2 add} def
noir
b .75       2.5  6.5  9.5  12.5  15.5 diag_en_boite
(Classe 1) 17 b [t dup] crtext
bleu
a .75       2  4.5  7.75  12.5  15.5 diag_en_boite
(Classe 2) 17 a [t dup] crtext