subtract 10%iles      0.00000    0.0224760     0.110535     0.202513
     0.323153     0.493249     0.754966      1.20873      2.23057
diff 10%iles    -0.473696    -0.201025   -0.0868301   -0.0197105      0.00000
    0.0175691    0.0840490     0.195879     0.464768
stardiff 10%iles   -0.0639518   -0.0232401  -0.00712396      0.00000
  0.000739664   0.00962144    0.0205495    0.0377079    0.0774448
stardiff contour -excluded 0.005   -0.0639518    0.0774448