subtract 10%iles      0.00000   0.00407219    0.0614374     0.130362
     0.219173     0.346982     0.567312     0.980968      1.89547
diff 10%iles    -0.419283    -0.172832   -0.0730374   -0.0179334      0.00000
    0.0128384    0.0681353     0.168012     0.412494
stardiff 10%iles   -0.0706243   -0.0273832   -0.0101935 -0.000104636
      0.00000   0.00701305    0.0179479    0.0355104    0.0769131
stardiff contour -excluded 0.005   -0.0706243    0.0769131