Fig. 8

Houston plots with six bins for each tidal index in region Sd. See Fig. 3c for how to read the figure. The horizontal axis shows the minimum-to-maximum range of each index. In no cases could the null hypothesis be rejected at the 5% significance level based on the Chi-square test. Bins with \({N}_{{\text{obs}}}\) = 0 have error bars of zero length. \(\Delta \alpha\) represents the uncertainty in the estimated parameter \(\alpha\) and corresponds to the 95% confidence interval of a Gaussian distribution (Yabe et al. 2015)