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Figure 3: The crossvalidation and prediction results of the partial least squares model using spectral variables within 3050–2800 cm^{−1} and 1800–400 cm^{−1}. The regression plot between the predicted and actual postmortem interval. The red line represents the reference line of the predicted PMI scores. The closer to it, the higher the goodness of fit will be. The blue dot represents the calibration set, while the red square represents the prediction set 
