A TRC can have any orientation in space. It is bounded by a conical surface and by two circular plane faces perpendicular to the axis of the cone. Each TRC is defined by 8 numbers: V_x, V_y, V_z, (coordinates of the centre of the major circular base), H_x, H_y, H_z (components of a vector corresponding to the TRC height, directed from the major to the minor base), R1 (radius of the major base), R2 (radius of the minor base) A TRC definition extends over 2 cards in default fixed format, or over 3 cards in high-accuracy body fixed format. Example in default fixed format:*...+....1....+....2....+....3....+....4....+....5....+....6....+....7..TRC 102 0.0 0.0 -130.0 0.0 0.0 1000.0 600. 150.0* (a truncated cone 1000 cm long parallel to the z axis, with the* larger circular base 600 cm in radius located at z = -130 and the* smaller base 150 cm in radius located at z = 870)The same example in high-accuracy body fixed format:*...+....1....+....2....+....3....+....4....+....5....+....6....+....7....+.TRC 102 0.0 0.0 -130.0 0.0 0.0 1000.0 600. 150.0 The same, in free format: TRC NewCone 0.0 0.0 -130.0 0.0 0.0 1000.0 600. 150.0