50
3 2
1 2 3
 a c
0.01 0.01 0.001
1e-3 1e-2 1e-2 1
0	10.49	0
20	7.5018	0.34029
40	6.3005	0.77354
60	5.7445	1.2294
80	5.4238	1.6829