The Surface graph or series is used to represent a set of three-dimensional data as a mesh surface. It has three mandatory series components, Position, Depth and Value. The data in the Position and Depth components must form a 2D rectangular grid on the xz plane. The elevations of the mesh cells are determined by the data in the Value component. The series also has an optional series component called LabelMember whose data may be used as the mark labels for the mesh cells.