subtract 10%iles      0.00000   0.00766182    0.0535312     0.101215
     0.156416     0.231489     0.350930     0.571675      1.13274
diff 10%iles    -0.301840    -0.119051   -0.0496328   -0.0114882      0.00000
    0.0103935    0.0494652     0.120823     0.307431
stardiff 10%iles   -0.0483863   -0.0162060  -0.00466588      0.00000
  0.000846464   0.00718738    0.0151764    0.0282490    0.0608394
stardiff contour -excluded 0.005   -0.0483863    0.0608394