subtract 10%iles      0.00000  0.000534132    0.0219376    0.0466204
    0.0758562     0.115126     0.173739     0.276613     0.537374
diff 10%iles    -0.218300   -0.0841031   -0.0354018  -0.00852609      0.00000
   0.00702500    0.0344372    0.0839796     0.219367
stardiff 10%iles   -0.0311381   -0.0105965  -0.00304153      0.00000
  0.000820242   0.00534923    0.0110039    0.0200331    0.0424659
stardiff contour -excluded 0.005   -0.0311381    0.0424659