Corner plot showing 1σ and 2σ (darker and lighter colored, respectively) confidence levels of our measurements and the nuisance parameters (q_cen and α_cen; see Sect. 2.4) for the z_20ex, Mz set. While we can confidently constrain the cluster masses (e.g., top left panel), the constraining power on the total mass concentration is unfortunately weak (top panel in the second column from the left).