Histogram of the sample clusters with |H| ≤ 300 pc and the distribution of the proportion of the sample clusters with the effective dip angle difference greater than 45° from each interval to the total clusters in each interval. The empty histogram represents the total clusters in each interval, while the shadow histogram the sample clusters with |q_all − q_core|_valid > 45° in each interval. The open purple pentagram in the panel represents the proportion of the sample clusters with the effective dip angle difference greater than 45° from each interval to the total clusters in each interval. The blue dashed line marks the mean of these proportions and the red dashed line represents its error.