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Scatter plots comparing true and predicted wheat spike counts at different grain-filling stages: (a) early, (b) mid, (c) late, and (d) all stages combined. In each subplot, data points (one per sample) are shown for two input data types (SpikeGrainSurface, SpikeletSurface). The dashed red 1:1 line indicates perfect agreement between predicted and true values. The legend in each panel reports the coefficient of determination (R²) and root mean square error (RMSE) for each input type
