R Precision(?m)

-0.01?+0.01
-0.01?0.01
0.005?-0.005
0.01?-0.01
0.025?-0.025
0.02?-0.02
0?+0.04
0?-0.030
?0.003??0.003
?0.01
?0.015
?0.01??0.01
?0.02
?10
?20