GENSERIES_SPEC allows you to pass a generated series to a UAF function rather than using a pre-existing series instance. GENSERIES_SPEC contains all the information that can be derived from a SERIES_SPEC element as well as the information required to generate the series. The GENSERIES_SPEC element can only be passed to a function that accepts a single series as input.
Generated series have a indexing mechanism which starts at integer 0 and increments by 1 for each additional generated entry.