Some PIs opt for rapid data release (at maximum 1 month after data
acquisition) knowing that the data are well-suited for validation and
quick-look purposes but are possibly of somewhat lesser data quality or
possibly have less information content than the usual NDACC-qualified data. 

NDACC provides opportunity for PIs to upload RD data in the HDF format.
In that case, the data will carry the substring .RD. as the initial characters 
of the string entry in the DATA_QUALITY attribute of the (GEOMS HDF) data file.

The RD data are available at the NDACC DHF at
https://www-air.larc.nasa.gov/missions/ndacc/data.html?RapidDelivery=rd-list
or in a directory structure at
https://www-air.larc.nasa.gov/pub/NDACC/PUBLIC/RD/.

As soon as the PI has submitted the consolidated version of these 'rapid
delivery' data, the RD data will be removed from the database and the
consolidated data will be found in the usual station directories.