As a general practice, Level-2 and Level-3 data (denoted (L2 and L3 in file names)
should be used where available while accessing only the highest version numbers.
Current best data are:
L2 and L3 inertial frame data version v1.1.3.2 for 2012-10-08 through 2013-05-05.
L2-uvw data version v1.1.3.1 for 2013-05-06 through 2013-05-20.
QL-uvw payload-frame data for dates before and after the above intervals.
L2 and L3 production continues for intervals both before and after the above.
QL-uvw is processed routinely to keep within a few days of measurement.