There are 4 kinds of infinite half-spaces. Three of them are delimited by planes perpendicular to the coordinate axes: Delimited by a plane perpendicular to the x-axis. Code: YZP or by a plane perpendicular to the y-axis. Code: XZP or by a plane perpendicular to the z-axis. Code: XYP Each of these half-spaces is defined by a single number: V_x (resp. V_y, or V_z), the coordinate of the plane on the corresponding perpendicular axis. The half-space "inside the body" is the locus of points for which x < V_x (resp. y < V_y, or z < V_z). An YZP, XZP, XYP definition, in fixed format, extends always over a single line. Example in default fixed format:*...+....1....+....2....+....3....+....4....+....5....+....6....+....7..YZP 71 -44.2 XZP 72 108.0 XYP 73 0.0* (respectively, all points having x < -44.2, those having y < 108,* and those having z < 0).The same example in high-accuracy body fixed format:*...+....1....+....2....+....3....+....4....+....5....+....6....+....7....+.YZP 71 -44.2 XZP 72 108.0 XYP 73 0.0 The same example in free format: YZP horizPla -44.2 XZP vertPla1 108.0 XYP vertPla2 0.0