subtract 10%iles      0.00000   0.00631952    0.0767896     0.159853
     0.266273     0.414625     0.658485      1.09062      2.04808
diff 10%iles    -0.455730    -0.189028   -0.0785522   -0.0170622      0.00000
    0.0171442    0.0792789     0.189856     0.454644
stardiff 10%iles   -0.0669492   -0.0235739  -0.00680143      0.00000
  0.000916369   0.00984010    0.0213049    0.0399984    0.0832634
stardiff contour -excluded 0.005   -0.0669492    0.0832634