ERM for the tile-pawprint linking tables matched with the Source table. Detections in the Source table come from tiles. In each MergeLog row there will be at least one non-default tile with a maximum equal to the number of filters used in the programme. Each entry in MergeLog, including defaults is matched to a TileSet and each Source row to a similar number of rows in TilePawPrintsTDOnly, some of which may be default depending on whether there was a detection in each observed filter. The relationship between MergeLog and TilePawPrintsTDOnly is necessary because the multiframe extension information in MergeLog is found in TilePawPrintTDonly, not TileSet.