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1. Rectangular Parallelepiped. Code: RPP

      An RPP has its edges parallel to the coordinate axes.
      It is defined by 6 numbers in the following order:
      X_min, X_max, Y_min, Y_max, Z_min, Z_max (minimum and maximum
      coordinates which bound the parallelepiped).
      Warning! Of course X_min must be < X_max, Y_min < Y_max and Z_min < Z_max.
      If this condition is not satisfied, the body is ignored.
      An RPP definition extends over one single card in default fixed format,
      or over two cards in high-accuracy body fixed format (IDBG = -10 or -100
      in the CG Title card, see above).

      Example in default fixed format (the comment lines shown are allowed input
      lines):
*...+....1....+....2....+....3....+....4....+....5....+....6....+....7..
RPP 4 -20.0 +20.0 -50.0 +50.0 -38.5 +38.5
* (a parallelepiped centreed on the origin)
The same input, in high-accuracy fixed format, would be:
*...+....1....+....2....+....3....+....4....+....5....+....6....+....7....+.
RPP 4 -20.0 +20.0 -50.0 +50.0 -38.5 +38.5 The same, in free format: RPP Smlbrick -20.0 +20.0 -50.0 +50.0 -38.5 +38.5

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