subtract 10%iles      0.00000   0.00616121    0.0486896    0.0931411
     0.145728     0.218476     0.333982     0.547801      1.09374
diff 10%iles    -0.305462    -0.120905   -0.0505466   -0.0117893      0.00000
    0.0103631    0.0500212     0.122385     0.310600
stardiff 10%iles   -0.0524288   -0.0182296  -0.00563360      0.00000
  0.000490606   0.00737734    0.0161816    0.0304648    0.0656855
stardiff contour -excluded 0.005   -0.0524288    0.0656855