A BOX is also a Rectangular Parallelepiped, but with arbitrary orientation in space. Its use is generally not recommended, since it can be replaced by a suitable combination of infinite planes (PLA, XYP, XZP, YZP). Planes are easier to define, make tracking more accurate and often only a few are needed in a region description. A BOX is defined by 12 numbers in the following order: V_x, V_y, V_z (coordinates of a vertex), H1_x, H1_y, H1_z, H2_x, H2_y, H2_z, H3_x, H3_y, H3_z (x, y and z components of three mutually PERPENDICULAR vectors representing the height, width and length of the box). Note that it is the user's responsibility to ensure perpendicularity. This is best attained if the user has chosen high-accuracy input fixed format (IDBG = -10 or -100 in the CG Title card, see above), or free format, and the value of each vector component is expressed with the largest available number of significant digits. A BOX definition extends over 2 cards in default fixed format, or over 4 cards in high-accuracy body fixed format. Example in default fixed format:*...+....1....+....2....+....3....+....4....+....5....+....6....+....7..BOX 18 0.0 0.0 0.0 7.0710678 7.0710678 0.0 -14.142136 14.142136 0.0 0.0 0.0 30.0* (a parallelepiped with a corner on the origin, with edges 10, 20 and* 30 cm long, rotated counterclockwise by 45 degrees in the x-y plane)The same example in high-accuracy body fixed format:*...+....1....+....2....+....3....+....4....+....5....+....6....+....7....+.BOX 18 0.0 0.0 0.0 7.071067811865475 7.071067811865475 0.0 -14.14213562373095 14.14213562373095 0.0 0.0 0.0 30.0 The same, in free format: BOX tiltslab 0.0 0.0 0.0 7.071067811865475 7.071067811865475 0.0 -14.14213562373095 14.14213562373095 0.0 0.0 0.0 30.0