subtract 10%iles  -0.00193167   0.00960255    0.0204811    0.0330656
    0.0490389    0.0706215     0.102095     0.154129     0.270884
diff 10%iles    -0.136257   -0.0638742   -0.0327721   -0.0139942  0.000584602
    0.0150771    0.0337262    0.0646129     0.136425
stardiff 10%iles   -0.0355934   -0.0177002  -0.00890980  -0.00246658
   0.00312671   0.00861055    0.0147552    0.0231471    0.0399871
stardiff contour -excluded 0.005   -0.0355934    0.0399871