subtract 10%iles  -0.00170851    0.0100093    0.0210705    0.0336895
    0.0493193    0.0702686     0.101256     0.154981     0.287571
diff 10%iles    -0.132163   -0.0600171   -0.0309963   -0.0132990  0.000685692
    0.0146217    0.0322123    0.0611053     0.133110
stardiff 10%iles   -0.0369595   -0.0179965  -0.00898305  -0.00249980
   0.00313248   0.00870977    0.0150610    0.0238941    0.0422346
stardiff contour -excluded 0.005   -0.0369595    0.0422345