subtract 10%iles      0.00000      0.00000    0.0189590    0.0429883
    0.0727793     0.112891     0.172779     0.278016     0.543371
diff 10%iles    -0.206986   -0.0808420   -0.0341560  -0.00800323      0.00000
   0.00659776    0.0323107    0.0782223     0.204360
stardiff 10%iles   -0.0298215  -0.00978243  -0.00253714      0.00000
   0.00102437   0.00529047    0.0105303    0.0187622    0.0387437
stardiff contour -excluded 0.005   -0.0298215    0.0387436