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The main table and subtables within a MeasurementSet may not have the same number of rows. As a result, accessing pieces of information in different subtables will sometimes require more complicated indexing than in a standard flat table.
In general, this can be treated using the table 'query' method to create subtables based on indexing expressions.
For example,
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It is useful to note that two of the major tables for data analysis, the main table and NS_GBT_BACKEND do have the same number of rows so the indexing is trivial in this case.