subtract 10%iles      0.00000      0.00000    0.0228062    0.0551548
    0.0942476     0.145637     0.220056     0.347609     0.653884
diff 10%iles    -0.248486    -0.101417   -0.0437052   -0.0100706      0.00000
   0.00873494    0.0412722    0.0977383     0.245283
stardiff 10%iles   -0.0363398   -0.0124214  -0.00340863      0.00000
  0.000838377   0.00570587    0.0117412    0.0212922    0.0441924
stardiff contour -excluded 0.005   -0.0363398    0.0441923