we don't have counts of the things that were dated, but we do know that at least one something had to be present to have been dated,
and in SEAD it is the abundances table that become an analysis entity, which in turn has analysis values and/or geochronological results. Therefore, we need this entity, too.
- create a data-derived entity for abundances
- select
labnr,sort, andart_1 - add an extra column, abundance and give it always a value of 1, now we have “counted” everything that was dated
