THE DES Y1 CATALOGUES  
2.1 redMaPPer cluster catalogue  
2.2 Photometric redshift catalogue  
2.3 Assigning $\mu_{\star}$ for redMaPPer clusters  
2.4 Weak lensing shear catalogue

THE STACKED CLUSTER PROFILES  
3.1 Projected surface mass density profiles  
3.2 Covariance matrices for ∆Σ  
3.3 Projected surface mass density model  
3.4 The full model  
3.5 Modelling systematics

THE MASS–$\mu_{\star}$–REDSHIFT RELATION

RESULTS

DISCUSSION  
6.1 The relationship between $\lambda$ and $\mu_{\star}$ and implications for the slope $F_{\mu}$ ⋆  
6.2 The redshift evolution of the $M{-}\mu_{\star}{-}z$ relation  
6.3 Comparison with previous work and considerations about selection effects  
6.4 Possible implications for cluster cosmology

SUMMARY