Colour ratio phase curves for the four datasets with different spatial scales. Panels ato d show the results for the CMOS-bin1, CMOS- bin2, CMOS-bin4, and CMOS-whole datasets, respectively. Each point in these subfigures is the mean value within a 1° phase angle bin. The lines in these subfigures are the best-fit results with either a first-order polynomial or a third-order polynomial.