subtract 10%iles  -0.00276136    0.0134621    0.0297024    0.0488424
    0.0728092     0.104656     0.150635     0.227219     0.402207
diff 10%iles    -0.176399   -0.0848465   -0.0440857   -0.0187087  0.000846863
    0.0203648    0.0456185    0.0860891     0.176882
stardiff 10%iles   -0.0437681   -0.0201666  -0.00962740  -0.00237458
   0.00380652   0.00993263    0.0170080    0.0271049    0.0486580
stardiff contour -excluded 0.005   -0.0437681    0.0486580