Windchill Database Relationships - As Stored Baselines

Curious if anyone knows what tables the "As Stored" baselines are kept in.  If I understand correctly, every time a group of related objects is checked in together, a hidden baseline is created.  This allows the "as stored" configuration to be recalled in the future (what version of each object was used).  I would like to know what database table(s) this information is kept in.  From what I can tell, EPMMemberLink and EMPReferenceLink are not the place.  Thanks.