subtract 10%iles   -0.0203383      0.00000   0.00520086    0.0389011
    0.0798776     0.135011     0.218239     0.363674     0.715920
diff 10%iles    -0.289821    -0.121543   -0.0526350   -0.0126224      0.00000
   0.00928497    0.0473080     0.113771     0.281940
stardiff 10%iles   -0.0454373   -0.0167393  -0.00539701      0.00000
      0.00000   0.00559134    0.0126295    0.0236578    0.0496388
stardiff contour -excluded 0.005   -0.0454373    0.0496387