u	chain	step	time	site	value	std_error	std_dev
0	2	0	0	0.0	1	0.120114	0.000703	0.002812
1	2	0	0	0.0	2	0.327999	0.000911	0.003646
2	2	0	0	0.0	3	0.520159	0.001005	0.004020
3	2	0	0	0.0	4	1.031135	0.001032	0.004127
4	2	0	0	0.0	5	1.030576	0.000993	0.003973