Name of the structure containing the coast lines. It can be:

• A data frame: the first column corresponds to the longitude and the second column to the latitude of the coast line.

• Either the keyword "world" or a country name. This will display the coast lines or the border of the country. It requires the libraries 'maps' and 'mapdata'.

When TRUE, the coast line is represented as points; otherwise it is represented as a polyline. The interest of this option is to avoid spurious lines that may appear when using specific projections.

Color used to draw the coast

Symbol size used to represent the coast. This parameter is used only when 'flag.as.points' is switched ON.

When FALSE, the coast line is loaded from the package 'maps' that needs to be installed. When TRUE, the coast line comes from the package 'mapdata' which needs to be installed beforehand. This argument is left as the user may ask for low(mid) accuracy representation which saves time.

Arguments passed to lines, lines3d