Small MultiDark Planck Catalogs Public Release, version 1.0 (August 21, 2016).

Each "hlist" file is a catalog which contains all the halos and subhalos at a
single simulation output, in ASCII format.

The numbers in the filename (e.g., hlist_0.XYZ) refer to the scale factor of the
output.  Each halo record is a single line, which has many space-separated columns.
The details of what is in each column is contained in the first few lines of each
catalog, and includes halo positions, velocities, masses, and many other useful
properties.  Some columns contain indices (e.g., depthFirstIndex) which are only
relevant for merger trees---these are kept only for consistency with the merger
tree format.

More complete column descriptions can be found in: http://arxiv.org/abs/1602.04813 (Rodriguez-Puebla et al. 2016).

If you use these catalogs, please cite the following three papers:

The original simulation paper: https://arxiv.org/abs/1411.4001 (Klypin et al. 2016)
The Rockstar halo finder paper: https://arxiv.org/abs/1110.4372 (Behroozi, Wechsler, and Wu, 2013).
The consistent merger trees paper: https://arxiv.org/abs/1110.4370 (Behroozi et al. 2013).

Please also add the following acknowledgements:

The SMDPL simulation and halo finding has been performed at LRZ Munich within the project pr87yi.  The CosmoSim database (www.cosmosim.org) providing the file access is a service by the Leibniz-Institute for Astrophysics Potsdam (AIP).