subtract 10%iles      0.00000    0.0180588     0.107212     0.200364
     0.321527     0.493503     0.757468      1.21154      2.23641
diff 10%iles    -0.471959    -0.200524   -0.0867138   -0.0197067      0.00000
    0.0176773    0.0838058     0.194805     0.462351
stardiff 10%iles   -0.0655444   -0.0241269  -0.00755300      0.00000
  0.000563772   0.00961531    0.0207829    0.0382268    0.0783967
stardiff contour -excluded 0.005   -0.0655444    0.0783966