Marker that is shown on the points. This is nil by default (no marker is displayed).

Flag determining if, in case of gradient brush, the area should have gradient that is interpolated from minimum to maximum values (YES), or it should be reinterpolated in each value (NO). The default value is NO.
If this flag is NO and the area series has gradient brush, the gradient will probably look like a saw repeating the shape of the area. If this flag is YES, the gradient looks linear and do not repeat the shape of the area.