subtract 10%iles   -0.0137815      0.00000   0.00630295    0.0348773
    0.0714881     0.123175     0.202750     0.343236     0.681558
diff 10%iles    -0.275614    -0.110527   -0.0460100   -0.0107481      0.00000
   0.00817013    0.0424922     0.105691     0.269668
stardiff 10%iles   -0.0402185   -0.0139806  -0.00399815      0.00000
  0.000649795   0.00590624    0.0125925    0.0233111    0.0482521
stardiff contour -excluded 0.005   -0.0402185    0.0482521