nlignes	ncolonnes
10	4
numer	mes1	mes2	mes3
1	 10.34	  7.75	9.00
2	 12.56	 15.02	13.76
3	 25.33	 20.27	18.99
4	145.39	170.98	166.90
5	200.67	192.43	194.55
6	  1.23	  2.11	2.13
7	125.36	120.78	126.09
8	100.06	98.53	91.25
9	  11.20	  12.51	12.33
10	66.66	77.77	55.55