subtract 10%iles      0.00000  0.000199389    0.0234528    0.0495527
    0.0794265     0.117887     0.173931     0.272477     0.524515
diff 10%iles    -0.201981   -0.0785623   -0.0335844  -0.00826073      0.00000
   0.00641251    0.0318708    0.0772872     0.201329
stardiff 10%iles   -0.0306427   -0.0109510  -0.00328040      0.00000
  0.000563592   0.00493131    0.0103205    0.0186560    0.0388455
stardiff contour -excluded 0.005   -0.0306427    0.0388455