subtract 10%iles      0.00000    0.0321627     0.114555     0.201061
     0.310076     0.465076     0.718969      1.17140      2.17873
diff 10%iles    -0.447315    -0.187013   -0.0788717   -0.0175228      0.00000
    0.0173817    0.0794706     0.187932     0.446160
stardiff 10%iles   -0.0651565   -0.0244150  -0.00739890      0.00000
  0.000951916    0.0101333    0.0219792    0.0406832    0.0826646
stardiff contour -excluded 0.005   -0.0651565    0.0826646