seems that I didn't manage to attach the .dat file.
So here is 12% thick board section:

p122510
1.000000 0.001278
0.993619 0.002110
0.982901 0.003491
0.970676 0.005040
0.956886 0.006757
0.941596 0.008624
0.925004 0.010608
0.907383 0.012669
0.889016 0.014769
0.870139 0.016879
0.850929 0.018979
0.831505 0.021054
0.811942 0.023098
0.792289 0.025106
0.772578 0.027076
0.752827 0.029006
0.733049 0.030897
0.713254 0.032747
0.693449 0.034557
0.673639 0.036325
0.653830 0.038051
0.634027 0.039734
0.614233 0.041373
0.594456 0.042967
0.574699 0.044514
0.554967 0.046011
0.535267 0.047458
0.515606 0.048849
0.495989 0.050184
0.476425 0.051458
0.456922 0.052667
0.437490 0.053806
0.418139 0.054872
0.398883 0.055857
0.379734 0.056757
0.360712 0.057565
0.341835 0.058272
0.323128 0.058872
0.304621 0.059355
0.286349 0.059713
0.268359 0.059937
0.250707 0.060017
0.233461 0.059945
0.216696 0.059709
0.200480 0.059296
0.184876 0.058701
0.169948 0.057921
0.155758 0.056960
0.142359 0.055829
0.129798 0.054544
0.118103 0.053128
0.107284 0.051605
0.097330 0.050001
0.088210 0.048340
0.079877 0.046643
0.072275 0.044926
0.065339 0.043201
0.059008 0.041478
0.053220 0.039761
0.047918 0.038053
0.043050 0.036355
0.038571 0.034665
0.034441 0.032982
0.030626 0.031303
0.027095 0.029624
0.023823 0.027940
0.020790 0.026247
0.017978 0.024540
0.015373 0.022812
0.012966 0.021058
0.010750 0.019271
0.008722 0.017445
0.006881 0.015574
0.005237 0.013650
0.003784 0.011677
0.002568 0.009636
0.001540 0.007555
0.000799 0.005422
0.000291 0.003251
0.000022 0.001085
0.000022 -0.001085
0.000291 -0.003251
0.000799 -0.005422
0.001540 -0.007555
0.002568 -0.009636
0.003784 -0.011677
0.005237 -0.013650
0.006881 -0.015575
0.008722 -0.017445
0.010750 -0.019271
0.012966 -0.021058
0.015373 -0.022812
0.017978 -0.024540
0.020790 -0.026247
0.023823 -0.027940
0.027095 -0.029624
0.030626 -0.031303
0.034441 -0.032982
0.038571 -0.034665
0.043050 -0.036355
0.047918 -0.038053
0.053220 -0.039761
0.059008 -0.041478
0.065339 -0.043201
0.072275 -0.044926
0.079877 -0.046643
0.088210 -0.048341
0.097330 -0.050001
0.107284 -0.051605
0.118103 -0.053128
0.129798 -0.054544
0.142360 -0.055829
0.155758 -0.056960
0.169949 -0.057921
0.184876 -0.058701
0.200480 -0.059296
0.216697 -0.059709
0.233462 -0.059945
0.250707 -0.060017
0.268359 -0.059937
0.286349 -0.059713
0.304621 -0.059355
0.323128 -0.058872
0.341835 -0.058272
0.360712 -0.057565
0.379734 -0.056757
0.398882 -0.055857
0.418139 -0.054872
0.437490 -0.053806
0.456922 -0.052667
0.476425 -0.051458
0.495989 -0.050184
0.515606 -0.048849
0.535267 -0.047458
0.554967 -0.046011
0.574698 -0.044514
0.594456 -0.042967
0.614233 -0.041373
0.634026 -0.039734
0.653830 -0.038051
0.673639 -0.036325
0.693449 -0.034557
0.713254 -0.032747
0.733049 -0.030897
0.752827 -0.029006
0.772578 -0.027076
0.792289 -0.025106
0.811942 -0.023098
0.831504 -0.021054
0.850929 -0.018979
0.870139 -0.016879
0.889016 -0.014769
0.907383 -0.012669
0.925004 -0.010608
0.941596 -0.008624
0.956886 -0.006757
0.970676 -0.005040
0.982901 -0.003491
0.993619 -0.002110
1.000000 -0.001278

Cheers,

Klaus