subtract 10%iles      0.00000  0.000512600    0.0262051    0.0574336
    0.0954490     0.149085     0.231011     0.372501     0.704166
diff 10%iles    -0.262892    -0.104602   -0.0434442  -0.00985849      0.00000
   0.00824440    0.0407007     0.100811     0.258313
stardiff 10%iles   -0.0383702   -0.0126070  -0.00323778      0.00000
   0.00102921   0.00604181    0.0123411    0.0225594    0.0470626
stardiff contour -excluded 0.005   -0.0383702    0.0470626