NSS orbital models compatible with two-body solution

This table contains non-single-star orbital models for sources compatible with an orbital two-body solution. This covers astrometric binaries, spectroscopic binaries, eclipsing binaries and certain combinations thereof. Several possible models are hosted within the same table and they are indicated by the field <code>nss_solution_type</code>. The description of this latter lists all possible solution types considered for this release. Only a selection of parameters hosted in this table are provided here, depending on the solution. The details of those is given in the description of field <code>bit_index</code>, which can also be used to extract the relevant elements of the correlation vector <code>corr_vec</code>.Details about the formalism used to derive the parameters in this table are given in the on-line documentation, see Chapter cu4nss. Warning: as a source may receive independent astrometric, spectroscopic or photometric orbits, a query using a given <code>source_id</code> may return several solutions. This has to be accounted for when doing a crossmatch by <code>source_id</code>.