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Coherence threshold vs. disparity gradient for the cross-correlation model with different window sizes. Different colors represent thresholds obtained for different sizes of the correlation window: red for 6 arcmin, blue for 18 arcmin, and green for 30 arcmin. Different symbol types represent thresholds for different spatial frequencies: squares and triangles for 0.3 and 0.6 cpd, respectively. Error bars are standard errors of the means calculated by bootstrapping.
