subtract 10%iles -0.000551939      0.00000    0.0150461    0.0378060
    0.0655937     0.102821     0.158154     0.255793     0.506193
diff 10%iles    -0.196727   -0.0765190   -0.0326719  -0.00790739      0.00000
   0.00607491    0.0305893    0.0740414     0.193878
stardiff 10%iles   -0.0291402  -0.00989392  -0.00280141      0.00000
  0.000727072   0.00482355   0.00989313    0.0178572    0.0373663
stardiff contour -excluded 0.005   -0.0291402    0.0373663