subtract 10%iles      0.00000      0.00000    0.0205426    0.0483809
    0.0815436     0.123543     0.183033     0.282369     0.518784
stardiff 10%iles    -0.192823   -0.0837004   -0.0390855   -0.0116165
      0.00000   0.00417372    0.0307889    0.0754641     0.186249
stardiff contour -excluded 0.005    -0.192823     0.186249