Units are written using superscript, eg. kg m^-3.

Subscript is used for annotated units, eg. kg_FW (kilogram fresh weight)

Data is entered and delivered by MERLIN-Expo in SI-units.

Contaminant masses in MERLIN-Expo is entered in mg. The time unit is days.

This means that flows of contaminants are given in mg day^-1.