subtract 10%iles      0.00000  0.000380509    0.0252955    0.0539920
    0.0890908     0.137930     0.213243     0.345136     0.661135
diff 10%iles    -0.252240    -0.100783   -0.0424815   -0.0102261      0.00000
   0.00726318    0.0385419    0.0959561     0.246843
stardiff 10%iles   -0.0383577   -0.0132593  -0.00402713      0.00000
  0.000375610   0.00530764    0.0115855    0.0216571    0.0459284
stardiff contour -excluded 0.005   -0.0383577    0.0459284