Our paper on the orbits that make up the X-shape in the Milky Way’s bar by my former undergraduate Caleb Abbott has just been accepted for publication in MNRAS. We show that box orbits and  their resonant cousins make the X-shape. Over 20% of the mass of the bar is associated with the X and most of the orbits (>70%) in the bar contribute to the Box/Peanut/X.

A preprint of this paper is available at: https://arxiv.org/abs/1703.07366