1 INTRODUCTION  
2 OBSERVABLES AND MODELS  
2.1 DES-Y1 Observables  
2.2 The FDM Power Spectrum  
2.3 Halo Model and HMC ODE  
2.4 Halo Model and Lensing Observables for FDM  
3 DATA AND METHODOLOGY  
3.1 Statistical Methods  
3.2 DES Data Sets  
3.3 Planck Data and Data Combination  
3.4 Parameters, Priors, and Models  
4 RESULTS  
5 DISCUSSION AND CONCLUSIONS