subtract 10%iles      0.00000   0.00408340    0.0500643     0.101899
     0.170046     0.268569     0.422870     0.700478      1.37768
diff 10%iles    -0.345692    -0.147868   -0.0632801   -0.0145588      0.00000
    0.0118079    0.0583817     0.140157     0.336431
stardiff 10%iles   -0.0505104   -0.0176724  -0.00460174      0.00000
   0.00128744   0.00819078    0.0167767    0.0301953    0.0598198
stardiff contour -excluded 0.005   -0.0505104    0.0598197