%t	B measured
0	4
5	4
10	8.5
12.5	11.4
15	15.2
17.5	18.4
20	21.2
22.5	25
25	28.6
27.5	31.5
30	33.1
32.5	35.4
35	37.1
40	38.6
45	39.7
50	40.3
55	40.7
60	41