subtract 10%iles      0.00000      0.00000    0.0154068    0.0374389
    0.0639422    0.0997324     0.153529     0.249885     0.497765
diff 10%iles    -0.194354   -0.0755554   -0.0323853  -0.00802469      0.00000
   0.00587273    0.0300908    0.0729818     0.191497
stardiff 10%iles   -0.0296255   -0.0103308  -0.00316440      0.00000
  0.000458077   0.00463699   0.00980794    0.0179125    0.0379044
stardiff contour -excluded 0.005   -0.0296255    0.0379044