subtract 10%iles      0.00000    0.0108681    0.0829501     0.161218
     0.261344     0.407845     0.638541      1.04574      1.98467
diff 10%iles    -0.425597    -0.183428   -0.0792097   -0.0177042      0.00000
    0.0156236    0.0747273     0.176893     0.419294
stardiff 10%iles   -0.0608878   -0.0222015  -0.00647956      0.00000
  0.000864186   0.00901514    0.0190315    0.0345769    0.0692593
stardiff contour -excluded 0.005   -0.0608878    0.0692593