subtract 10%iles  -0.00157452    0.0223844    0.0460391    0.0728703
     0.105441     0.147675     0.207106     0.301614     0.501663
diff 10%iles    -0.205536    -0.102833   -0.0552669   -0.0241032   0.00108933
    0.0262990    0.0575418     0.105059     0.207352
stardiff 10%iles   -0.0478362   -0.0225859   -0.0107195  -0.00259960
   0.00427470    0.0110944    0.0189970    0.0302040    0.0532029
stardiff contour -excluded 0.005   -0.0478362    0.0532028