subtract 10%iles  -0.00397587   0.00896549    0.0211053    0.0352569
    0.0532093    0.0776453     0.113800     0.175852     0.324357
diff 10%iles    -0.152771   -0.0720205   -0.0367198   -0.0152082   0.00133514
    0.0178885    0.0394745    0.0748596     0.155235
stardiff 10%iles   -0.0382539   -0.0179766  -0.00852926  -0.00185162
   0.00392538   0.00969301    0.0163320    0.0257183    0.0454172
stardiff contour -excluded 0.005   -0.0382539    0.0454172