10	mean.spring= 4.514035721539981	var.spring= 2.133478472400680
20	mean.spring= 9.537863269516695	var.spring= 3.096363716724188
40	mean.spring= 19.481857699527922	var.spring= 4.415426473065526
80	mean.spring= 39.542158518311602	var.spring= 6.298911040548727