subtract 10%iles      0.00000   0.00203657    0.0282552    0.0571816
    0.0913215     0.137289     0.206055     0.326547     0.622398
diff 10%iles    -0.232948   -0.0914590   -0.0385995  -0.00935113      0.00000
   0.00731683    0.0368373    0.0908539     0.235394
stardiff 10%iles   -0.0336900   -0.0114743  -0.00346706      0.00000
  0.000572145   0.00522845    0.0110929    0.0204786    0.0441403
stardiff contour -excluded 0.005   -0.0336900    0.0441402