subtract 10%iles      0.00000    0.0185323     0.108103     0.202991
     0.324562     0.493982     0.753143      1.20334      2.21520
diff 10%iles    -0.475545    -0.202977   -0.0892529   -0.0219328      0.00000
    0.0158710    0.0822837     0.193971     0.462308
stardiff 10%iles   -0.0670384   -0.0260925  -0.00948551      0.00000
      0.00000   0.00771379    0.0187151    0.0356706    0.0747546
stardiff contour -excluded 0.005   -0.0670384    0.0747546