a rhoa stdev 
1.26 81.42 1.05
1.58 71.77 1.05
2.00 57.13 1.05
2.51 49.13 1.05
3.16 40.44 1.05
3.98 36.18 1.05
5.01 33.92 1.05
6.31 33.00 1.05
7.94 33.17 1.05
10.00 33.63 1.05
12.59 36.13 1.05
15.85 37.15 1.05
19.95 37.13 1.05
25.12 37.72 1.05
31.62 35.80 1.05