| LOCATION NAME | | Nominal | Name of lake where measurement was made |
| DATE_TIME | | Date/time | Date on which sample was gathered |
| DEPTH (m) | | Physical quantity | Distance below ice from which sample was drawn |
| PPR (ug C/L*d) | | Physical quantity | Primary productivity, measured as inorganic carbon uptake using 14C-bicarbonate |
| PPR COMMENTS | | Nominal | Helpful hints about the sample |
| DEPTH MASL | | Physical quantity | Depth referred to the Sea level. Distance below Mean Average Sea water level reference from which sample was drawn |
