u	chain	step	time	site	value	std_error	std_dev
0	2	0	0	0.0	1	0.119305	0.000796	0.003183
1	2	0	0	0.0	2	0.327674	0.001063	0.004253
2	2	0	0	0.0	3	0.520366	0.001064	0.004257
3	2	0	0	0.0	4	1.031991	0.001165	0.004658
4	2	0	0	0.0	5	1.032326	0.000967	0.003869