1 INTRODUCTION

2 DATA SAMPLE  
2.1 Photometric data  
2.2 Globular Cluster Numbers

3 ANALYSIS  
3.1 GALFITM  
3.2 Prospector

4 RESULTS  
4.1 Comparison between models with free and fixed redshifts  
4.2 Median stellar populations  
4.3 Comparison with the literature

5 DISCUSSION  
5.1 Mass–metallicity relation: Clues to the origins of UDGs  
5.2 Multiple classes of UDGs?

6 CONCLUSIONS