an aggregation definition, as the step of defining the aggregation needs to initialize all of the member datasets to determine the time axis, but in a multi-CDF dataset, that information is read from the descriptor file. With a TSERIES aggregation, however, the correct axis bounds are applied, and missing time steps are handled by filling the data for those time steps with missing-value flags.</p>
<p align="left">Previous to version 5.2 Ferret performs sanity checking on the data set by comparing these time