subtract 10%iles   -0.0102892      0.00000    0.0141014    0.0502462
    0.0950365     0.155790     0.246580     0.402689     0.768834
diff 10%iles    -0.294767    -0.124766   -0.0541155   -0.0132542      0.00000
   0.00890923    0.0474429     0.114934     0.283726
stardiff 10%iles   -0.0479925   -0.0179565  -0.00572225      0.00000
      0.00000   0.00574187    0.0128971    0.0241050    0.0504265
stardiff contour -excluded 0.005   -0.0479925    0.0504264