subtract 10%iles  -0.00170135   0.00637436    0.0135820    0.0216331
    0.0317230    0.0456791    0.0671644     0.105804     0.202986
diff 10%iles    -0.102367   -0.0443954   -0.0225611  -0.00976539  0.000313520
    0.0104146    0.0232446    0.0451050     0.102939
stardiff 10%iles   -0.0291060   -0.0145108  -0.00748409  -0.00237024
   0.00213738   0.00667572    0.0119020    0.0191960    0.0342150
stardiff contour -excluded 0.005   -0.0291060    0.0342150