subtract 10%iles      0.00000   0.00896239    0.0841854     0.166346
     0.270514     0.423535     0.665011      1.08910      2.04807
diff 10%iles    -0.436149    -0.187737   -0.0811841   -0.0182836      0.00000
    0.0159945    0.0770172     0.181873     0.429940
stardiff 10%iles   -0.0643293   -0.0235841  -0.00693175      0.00000
  0.000837851   0.00960247    0.0205463    0.0374741    0.0746996
stardiff contour -excluded 0.005   -0.0643293    0.0746994