TATC
I would agree if we were talking about a composite radar picture, as used at West Drayton, that uses 2 individual radar sources to cover different parts of the display - that has a seam and implications for control close to it. However, the multi-radar picture at LACC is a true 'mosaic' picture with no seams, providing both primary and secondary radar information, depending on the best returns received from the contributing radar sources.