The stellar density distribution of the bulge is analyzed through one of its tracers. We use oxygen-rich Miras variables from the Catchpole et al. (2016) survey and OGLE-III survey as standard candles. The average age of these stars is around 9 Gyr. The population traced by Mira variables matches a boxy bulge prediction, not an X-shaped one, because only one peak is observed in the density along the analyzed lines of sight, whereas the prediction of an X-shape gives two clear peaks.
@article{arxiv.1702.02539,
title = {Absence of an X-shaped Structure in the Milky Way Bulge Using Mira Variable Stars},
author = {Martin Lopez-Corredoira},
journal= {arXiv preprint arXiv:1702.02539},
year = {2017}
}