Fig. 5
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2D χ2 map constructed from the computed χ2 at each point (model) of the parameter grid. The free parameters of the model are the porosity and the grain size. The contours enclose the regions where the χ2 is smaller than the 5% (dashed line) and 15% (solid line) quartiles. To increase the contrast, the upper limit of the χ2 color map isset to the 50% quartiles.
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