Salutations: Default Format

Given the volume of correspondence being generated during the current crisis, salutations have become an issue and we were wondering if someone could shed some light on the following, The documentation states "Salutation fields are generated using the default formats for the current constituent type" but what/where is the default format.  We have 8 salutation formats in the table TR_SALUTATION_FORMAT, does it use one of these?  Presumably when GEN SAL is pressed (without selecting a specific salutation format), this is also using the default. 

Thanks

Carole