subtract 10%iles      0.00000  0.000195373    0.0640180     0.142318
     0.245926     0.395190     0.629176      1.04873      2.01342
diff 10%iles    -0.454870    -0.195971   -0.0857582   -0.0206643      0.00000
    0.0146188    0.0771134     0.183836     0.438908
stardiff 10%iles   -0.0694255   -0.0272035  -0.00974911      0.00000
      0.00000   0.00735331    0.0179431    0.0341737    0.0712436
stardiff contour -excluded 0.005   -0.0694255    0.0712436