Any abnormalities in the data are noted and these are then raised with the LHBs, thus enabling LHBs to check, correct or comment on their data and to provide contextual information where relevant.
Nodir unrhyw annormaleddau yn y data ac yna codir y rhain gyda'r BILlau i’w galluogi i wirio, cywiro neu roi sylwadau ar eu data a darparu gwybodaeth gyd-destunol lle bo hynny'n berthnasol.