Scaling relations between the count-rate (left) the richness (right) and the WL ($M_{500}^{\mathrm{WL}}$) and true masses (M₅₀₀). The black circles and blue diamonds denote the individual WL masses of the 72 association clusters and the stacked WL masses for the three sub-samples divided by richness from the 75 association clusters, respectively. The upper bounds of the WL masses and the associated arrows are used for the poor-fit clusters. The blue and magenta solid lines are the best-fit scaling relation with respect to the WL masses and the true masses (δ_CR = δ_λ = r_CR, WL = r_λ, WL = 0), respectively. The blue region is the 1σ uncertainty of the scaling relation with the WL masses. The red dotted, green dot-dashed, and orange dashed lines are the results of eRASS1 (Ghirardini et al. 2024), eRASS-DES (Grandis et al. 2024), and eFEDS (Chiu et al. 2022), respectively.