1. Introduction

2. Methodology  
2.1. Spectral observations and reduction  
2.2. Stacking procedure  
2.3. Photometry in VANDELS fields and stellar masses from SED fitting  
2.4. Beta slope and UV absolute magnitude estimations  
2.5. The UV absolute magnitude - β relation  
2.6. Metallicity calibrations from UV absorption indexes in Starburst 99 models  
2.7. Final sample selection  

3. Results  
3.1. Mass-metallicity relation from UV absorption indexes  
3.2. Redshift dependence of the MZR  
3.3. UV slope and stellar mass  
3.4. Metallicity dependence of the \(M_{*}\beta\) and \(M_{UV}\beta\) relations  
3.5. The attenuation - metallicity relation  

4. Discussion  
4.1. Comparison to semi-analytic models  
4.2. Future developments  

5. Summary and conclusions