subtract 10%iles      0.00000    0.0253901     0.112353     0.202234
     0.317855     0.482510     0.737661      1.18190      2.18314
diff 10%iles    -0.463637    -0.197090   -0.0851150   -0.0189643      0.00000
    0.0175078    0.0821371     0.192544     0.456261
stardiff 10%iles   -0.0654571   -0.0240589  -0.00755990      0.00000
  0.000616586   0.00975871    0.0210006    0.0384967    0.0789806
stardiff contour -excluded 0.005   -0.0654571    0.0789805