Reconstructed extinction maps from K-means clustering results and their Pearson correlation with ¹²CO integrated-intensity maps. Columns (1) and (3) display the reconstructed dust extinction maps. Columns (2) and (4) show the corresponding maps of the Pearson correlation between A_V and W_CO at the resultant distance for each cluster derived from the K-means clustering. The result marked with a red frame exhibits morphology most similar to that of the ¹²CO integrated-intensity map.