#1 , 2   ,3      ,4    ,err_x
#xm,ym   ,err_per,err_a,0.01
0.5, 1222,5.0    ,100  ,0.01
0.7, 430 ,15.0   ,40   ,0.05
1.0, 145 ,25.0   ,2    ,0.05
1.2, 97  ,15.0   ,1    ,0.1
2.0, 23  ,5.0    ,0.1  ,0.1