!B_perp   tail/peak  uncertainty
 0.0000    0.0662     0.0231
-0.0265    0.0493     0.0054
-0.0529    0.0433     0.0089
-0.0794    0.0429     0.0112
-0.1059    0.0418     0.0057
-0.1323    0.0294     0.0073
-0.1588    0.0329     0.0124
-0.1853    0.0399     0.0110 
-0.2117    0.0294     0.0084 
-0.2382   -0.0120     0.0091 
-0.2647    0.0313     0.0058 
-0.2911   -0.0064     0.0063 
-0.3176    0.0396     0.0084 
-0.3441    0.0479     0.0080 
-0.3705    0.0592     0.0115
-0.3970    0.0757     0.0141