subtract 10%iles  0.000754833    0.0142708    0.0278873    0.0435467
    0.0630894    0.0895457     0.129128     0.199265     0.376204
diff 10%iles    -0.138922   -0.0629640   -0.0329547   -0.0145135  0.000204086
    0.0148125    0.0328045    0.0617714     0.134724
stardiff 10%iles   -0.0429319   -0.0190162  -0.00909567  -0.00241938
   0.00323648   0.00885229    0.0153353    0.0246176    0.0452325
stardiff contour -excluded 0.005   -0.0429319    0.0452325