subtract 10%iles  -0.00167990   0.00900126    0.0192032    0.0309627
    0.0456486    0.0653439    0.0944815     0.145145     0.271103
diff 10%iles    -0.129085   -0.0580959   -0.0299015   -0.0128870  0.000556469
    0.0139599    0.0308650    0.0587311     0.128899
stardiff 10%iles   -0.0351513   -0.0172579  -0.00871323  -0.00250015
   0.00293187   0.00833196    0.0144381    0.0228357    0.0399399
stardiff contour -excluded 0.005   -0.0351513    0.0399399