subtract 10%iles      0.00000   0.00474811    0.0910606     0.176390
     0.280633     0.427755     0.662475      1.08563      2.07933
diff 10%iles    -0.473517    -0.202465   -0.0882459   -0.0212989      0.00000
    0.0158004    0.0813384     0.191901     0.456313
stardiff 10%iles   -0.0724181   -0.0287114   -0.0106420      0.00000
      0.00000   0.00781897    0.0191547    0.0364169    0.0763593
stardiff contour -excluded 0.005   -0.0724181    0.0763593