Table 1.

Appion Organization

Project	Description of the biological structure of study and related information, such as background information, preliminary data, user’s names, funding, biohazards, etc.
Experiments	A set of data acquired from Leginon microscopy sessions. The user provides a brief description for the experiment, and the database stores all acquisition parameters. All experiments are associated with a project.
Processing Runs	Individual attempts at processing and manipulation of the raw data collected during an experiment, e.g. particle picking, CTF estimation, reference-free classification, reconstruction.