8.2.4.13} 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 line in default
      fixed format, and over two lines 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, centred 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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