Refers to the suture line, the provincial line, fold line and so on the intersection of a short line, in order to imply that the suture is connected, as a mark of line alignment.

The benchmark beam of light is generated by semiconductor laser and received by light targets with PSD. Finally the measure of shaft center-line alignment is finished by optimum algorithm.

If widgets are used, minimize and match their sizing to surrounding screen elements such as text, to avoid excessive consumption of space, awkward alignment, and line spacing problems.