GASTRO Early data release 1

The files contain the data for the accreted stars, i.e. the stellar
halo, at t = 10 Gyr, of the models described in
https://arxiv.org/abs/2204.12187v1. Each file is named after the
corresponding model.

They contain:

- Galactocentric positions in cartesian coordidantes: X, Y, Z [kpc]
- Galactocentric velocities in cartesian coordinates: Vx, Vy, Vz [km/s]
- [Fe/H], and [O/Fe]