> For the complete documentation index, see [llms.txt](https://docs.caterpillarproject.org/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.caterpillarproject.org/data.md).

# Available Data

## Particle Data

The core N-body code used to run Caterpillar was a combination of `P-Gadget3` and `Gadget-4`.  The output of the simulation runs is the typical Gadget HDF5 output and should be compatible with all other downstream post-processing tools available in the community. These outputs are available at all 320 snapshots of the simulation from z = 127 to z = 0 with < 50 Myr resolution from z = 6 to z = 0.

For details, please see either our flagship paper or our Technical pages.

{% hint style="info" %}
Owing to the extreme size of the runs, particle data (z > 0) is only available upon request.
{% endhint %}

## Halo Catalogues

{% tabs %}
{% tab title="Rockstar" %}
We used a modified version of `ROCKSTAR` included full iterative unbinding but the outputs are consistent with the nominal outputs from standard `ROCKSTAR` catalogues. Please see the documentation at the [Rockstar repository](https://bitbucket.org/gfcstanford/rockstar/src/master/README.md) for details (See [Section 4. Outputs](https://bitbucket.org/gfcstanford/rockstar/src/master/README.md#markdown-header-output)). There are however a few important caveats relating to our outputs which differ from the nominal outputs.

e.g. M\_grav vs. Mvir vs npart\*m\_p
{% endtab %}

{% tab title="SUBFIND" %}
These can be made available upon request.
{% endtab %}
{% endtabs %}

## Merger Trees

The chosen merger tree system used is [consistent-trees](https://bitbucket.org/pbehroozi/consistent-trees/src/master/). Please see the `consistent-trees` [README](https://bitbucket.org/pbehroozi/consistent-trees/src/master/README.md) for direct information pertaining to its running and output.