subtract 10%iles      0.00000   0.00103712    0.0273672    0.0573745
    0.0934949     0.142272     0.214729     0.340928     0.645826
diff 10%iles    -0.238228   -0.0936602   -0.0394044  -0.00939703      0.00000
   0.00762153    0.0379796    0.0935755     0.241514
stardiff 10%iles   -0.0348470   -0.0118132  -0.00351152      0.00000
  0.000633791   0.00546512    0.0115708    0.0214470    0.0462357
stardiff contour -excluded 0.005   -0.0348470    0.0462356