subtract 10%iles      0.00000   0.00118208    0.0272142    0.0563600
    0.0901954     0.132766     0.194925     0.304676     0.581324
diff 10%iles    -0.220306   -0.0859365   -0.0363789  -0.00892806      0.00000
   0.00682878    0.0345798    0.0849876     0.221387
stardiff 10%iles   -0.0336043   -0.0116437  -0.00360393      0.00000
  0.000439793   0.00512435    0.0109952    0.0202447    0.0433872
stardiff contour -excluded 0.005   -0.0336043    0.0433872