Reversing Markers | Marker Orientation

### Composite Markers

A marker can be combined with another marker by selecting the Composite checkbox which will enable the secondary marker tab. If the Overlay checkbox is selected, the primary and secondary markers will be positioned so that their origins coincide, otherwise the secondary marker will be offset from the primary marker (see also Marker Offset below). Figure 9.8 shows two examples of composite markers: in Figure 9.8(a) the start and end markers are formed from a pointed arrow primary marker of size 5
and a composite bar secondary marker, while in Figure 9.8(b) the start and end markers are formed from an open semicircle primary marker of size 5bp with an overlaid reversed filled semicircle secondary marker of size 5bp.

| (a) | (b) |
Figure 9.8: Examples of composite markers: (a) a bar primary marker with a pointed secondary marker of size 5bp; (b) an open semicircle primary marker of size 5bp overlaid with a reversed filled semicircle secondary marker of size 5bp.

Reversing Markers | Marker Orientation