subtract 10%iles      0.00000      0.00000    0.0194225    0.0422654
    0.0695357     0.105887     0.159860     0.255431     0.501521
diff 10%iles    -0.195281   -0.0755050   -0.0320745  -0.00766516      0.00000
   0.00638914    0.0310682    0.0747674     0.194785
stardiff 10%iles   -0.0276477  -0.00947731  -0.00276234      0.00000
  0.000713315   0.00478550   0.00979428    0.0176241    0.0367948
stardiff contour -excluded 0.005   -0.0276477    0.0367947