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Table 3: Correlogram between different perfusion parameters using the Spearman rank correlation coefficient^{^a}
↵a Color coding is red for a very strong correlation (r_s >0.8); orange for a strong correlation (0.6 ≤ r_s ≤ 0.79), yellow for a moderate correlation (0.4 ≤ r_s ≤ 0.59), and green for a weak correlation (r_s <0.4).