> 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/faq.md).

# FAQ

## Should I contact a Caterpillar core member to use the data?

For using the merger tree and halo catalogs, no, you now no longer need to contact a core member. That being said however, we do encourage you to contact a core member as certain efforts may have been undertaken by groups either internally and externally and we can put you in direct contact with them to coordinate efforts.

## Why aren't the particle snapshots public?

This is primarily because unlink many other simulation suites, the particle resolution and snapshot resolution make it expensive to 100% host on public servers (e.g. Google Cloud Platform). Should you want more than the z = 0 snapshot, please get in touch so we can find the best path forward for your project.