subtract 10%iles      0.00000   0.00864637    0.0745344     0.146509
     0.238454     0.372556     0.587124     0.974140      1.89831
diff 10%iles    -0.411383    -0.177486   -0.0767341   -0.0179462      0.00000
    0.0140128    0.0707402     0.169365     0.403965
stardiff 10%iles   -0.0578912   -0.0213520  -0.00653593      0.00000
  0.000384776   0.00785709    0.0172660    0.0319262    0.0645126
stardiff contour -excluded 0.005   -0.0578912    0.0645125