This data item defines a cylindrical segment in space. Other data items can check if nodes are located on this geometry. The coordinate of the center point at the bottom is x_0 y_0 z_0. The coordinate of the center point at the top is x_1 y_1 z_1. If side_x is set to a positive value, say +1., then only x-values larger then x_c are considered to be part of the geometry. If side_y is set to a negative value, say -1., then only x-values smaller then x_c are considered to be part of the geometry. If side_x is set to 0 , then all x-values are considered to be part of the geometry. Likewise remarks hold for y- and z-values. The cylinder segment can only be used in 3D. All node within a distance tolerance of the radius are considered to be part of the cylinder.