Estimating Gaia's performance for O stars in the Outer Galactic plane using Herschel dataK.L.J. Rygl, S. Molinari, T. Prusti, T. Antoja, D. Elia and J. de BruijneEAS Publications Series, 67-68 (2014) 397DOI: https://doi.org/10.1051/eas/1567085