#1 , 2   ,3      ,4   
#xm,ym   ,err_per,err_a
0.5, 1222,5.0    ,100
0.7, 430 ,15.0   ,40
1.0, 145 ,25.0   ,2
1.2, 97  ,15.0   ,1
2.0, 23  ,5.0    ,0.1