subtract 10%iles      0.00000      0.00000    0.0181246    0.0411520
    0.0686321     0.105119     0.158467     0.251423     0.489805
diff 10%iles    -0.188881   -0.0728178   -0.0312535  -0.00754833      0.00000
   0.00609481    0.0296977    0.0714869     0.187084
stardiff 10%iles   -0.0280826  -0.00961114  -0.00262507      0.00000
  0.000890166   0.00498410   0.00993663    0.0176109    0.0364493
stardiff contour -excluded 0.005   -0.0280826    0.0364493