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Pairwise scatter plot matrix, and correlation coefficients (ρ) of HRCT histogram indices including NL, PFF, HAA_A, kurtosis, HAA, LAA at −200 (left), 0 (right), and 200 (centre) HU. HAA, being defined as the areas with attenuation values greater than −200 HU, is not shown in the first matrix. In NL, PFF, HAA_A, HAA, LAA parameters, the ‘%’ has been omitted for ease of reading.
