In addition to being on the side edge of the fingerboard, these mini-fretlines are visible on the top of the fingerboard, extending
about 3/16" in from the edge. These sidelines are placed exactly where the fret would be (just like on our lined fretless), so if the leading edge of your finger was right on the line, it would be in tune. Another way to
look at it: If you took a thin edge (like a credit card) and placed it exactly on the line (the "fretline"), it would be in tune. Side dots are the same as usual on a fretted bass: in the middle, between frets.