a   sigma_a b   sigma_b n
1.05, 0.09, 0.8, 0.8, 74
1.12, 0.11, 0.4, 0.9, 38
1.05, 0.05, 0.9, 0.4, 45
1.09, 0.07, 1.2, 0.5, 64
1.01, 0.06, 2.1, 0.5, 66
1.01, 0.05, 2.3, 0.4, 67
1.00, 0.06, 2.8, 0.4, 65
1.07, 0.07, 2.5, 0.5, 61
1.06, 0.08, 2.7, 0.5, 65
1.12, 0.07, 2.5, 0.5, 58
1.10, 0.09, 2.7, 0.6, 51
1.03, 0.07, 3.4, 0.4, 54
1.23, 0.08, 2.2, 0.5, 47