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13. Infinite Elliptical Cylinder parallel to an axis. Code: XEC, YEC, ZEC

      A XEC (YEC, ZEC) is an infinite elliptical cylinder parallel to the
      x (y, z) axis, and with the axes of the ellipse parallel to the other
      two coordinate axes.
      Each XEC (YEC, ZEC) is defined by 4 numbers:
      A_y, A_z (A_z, A_x for YEC, A_x, A_y for ZEC) (coordinates of the
      cylinder axis), L_y, L_z (L_z, L_x for YEC, L_x, L_y for ZEC)
      (semiaxes of the ellipse).
      A XEC (YEC, ZEC) definition extends over one single card in default
      fixed format, and over two cards in high-accuracy body fixed format.

      Example in default fixed format:
*...+....1....+....2....+....3....+....4....+....5....+....6....+....7..
ZEC 101 15.0 319.0 33.0 80.0
* (an infinite elliptical cylinder, centreed on x=15, y=319, with the
* ellipse minor semi-axis parallel to x, 33 cm long, and the major
* semi-axis parallel to y, 80 cm long)
The same example in high-accuracy body fixed format:
*...+....1....+....2....+....3....+....4....+....5....+....6....+....7....+.
ZEC 101 15.0 319.0 33.0 80.0 The same body, described in free format: ZEC ChimneyA 15.0 319.0 33.0 80.0

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