subtract 10%iles      0.00000      0.00000    0.0229492    0.0521485
    0.0872231     0.133121     0.200381     0.318316     0.609210
diff 10%iles    -0.232421   -0.0932441   -0.0402093  -0.00957370      0.00000
   0.00768948    0.0377560    0.0901666     0.229194
stardiff 10%iles   -0.0340132   -0.0116342  -0.00329717      0.00000
  0.000692584   0.00522177    0.0108457    0.0197915    0.0416101
stardiff contour -excluded 0.005   -0.0340132    0.0416101