Auxiliary data: aux

Data files residing under aux contain ``auxiliary'' information that is needed to understand or otherwise make use of the data products derived from the spacecraft telemetry. These data are considered auxiliary because they result from mission planning or on-ground mission analysis, and not from the instrument telemetry. Examples of auxiliary data include the spacecraft attitude and orbit, the time-line, the On-Board Time (OBT) - Universal Time (UTC) correlation, information related to the proposals and the planning, etc.