input courbescp; beginfig(1); depart((0,0),(17,14),(6,7),1,1); grille(0.5); axes; graduationx(btex $I$ etex); graduationy(btex $J$ etex); endfig; beginfig(3); depart((0,0),(17,15),(1,1),2,2); grille(0.5); axes; graduationx(btex 10 etex); graduationy(btex 10 etex); endfig; end