subtract 10%iles  -0.00391507      0.00000    0.0116310    0.0350109
    0.0643754     0.104784     0.165896     0.274312     0.548791
diff 10%iles    -0.214692   -0.0839717   -0.0354623  -0.00848627      0.00000
   0.00654322    0.0332241    0.0810790     0.211599
stardiff 10%iles   -0.0313978   -0.0104455  -0.00284486      0.00000
  0.000872139   0.00527008    0.0108008    0.0196075    0.0410055
stardiff contour -excluded 0.005   -0.0313978    0.0410055