subtract 10%iles      0.00000    0.0152081     0.103046     0.198529
     0.319935     0.489154     0.747604      1.19798      2.20681
diff 10%iles    -0.474293    -0.201462   -0.0874183   -0.0198641      0.00000
    0.0177040    0.0842552     0.196313     0.464903
stardiff 10%iles   -0.0653489   -0.0240131  -0.00745841      0.00000
  0.000616729   0.00965428    0.0207665    0.0382367    0.0786059
stardiff contour -excluded 0.005   -0.0653489    0.0786059