subtract 10%iles  -0.00114727      0.00000    0.0140238    0.0365162
    0.0640221     0.100646     0.154538     0.248046     0.486573
diff 10%iles    -0.188523   -0.0727577   -0.0310574  -0.00739455      0.00000
   0.00623298    0.0298603    0.0715673     0.186945
stardiff 10%iles   -0.0269045  -0.00909532  -0.00249156      0.00000
  0.000886797   0.00486919   0.00975774    0.0173687    0.0359106
stardiff contour -excluded 0.005   -0.0269045    0.0359106