subtract 10%iles      0.00000  0.000193119    0.0247571    0.0542250
    0.0895917     0.135397     0.197937     0.305774     0.576803
diff 10%iles    -0.214738   -0.0832802   -0.0352592  -0.00853181      0.00000
   0.00690877    0.0339284    0.0828812     0.216084
stardiff 10%iles   -0.0313696   -0.0107291  -0.00309235      0.00000
  0.000747366   0.00522021    0.0107784    0.0195652    0.0412920
stardiff contour -excluded 0.005   -0.0313696    0.0412920