p1=['1.8','1.7','1.6','1.5','1.4','1.3','1.2','1.1']
p2=['2.6','2.5','2.4','2.3','2.2','2.1','','']
p3=['3.2','3.1','','','']
p4=['4.2','4.1','','','','','','','']
liste_proc = [p1, p2, p3, p4]