subtract 10%iles      0.00000      0.00000    0.0298471    0.0673232
     0.113451     0.175526     0.267287     0.419634     0.759090
diff 10%iles    -0.276276    -0.115383   -0.0504684   -0.0128462      0.00000
   0.00796771    0.0440791     0.107125     0.267584
stardiff 10%iles   -0.0438051   -0.0162296  -0.00543186      0.00000
      0.00000   0.00520062    0.0119865    0.0226415    0.0474637
stardiff contour -excluded 0.005   -0.0438051    0.0474636