1. Introduction  
2. Observational data  
2.1. Gaia-ESO survey spectroscopic data  
2.2. Optical and NIR photometry  
2.3. X-ray data  
3. Cross-correlations among catalogs  
4. Membership strategy  
5. Candidate giants and MS field stars in the GES sample  
6. Interstellar reddening  
7. Reddening law  
8. Spatial distributions and nebula structure  
9. Discussion  
10. Summary and conclusions