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5. Right Elliptical Cylinder. Code: REC

      A REC can have any orientation in space.
      It is limited by a cylindrical elliptical surface and by two plane
      faces perpendicular to its axis. (If the cylinder axis is parallel
      to one of the coordinate axes, it is worth considering instead the
      use of an infinite cylinder XEC, YEC or ZEC (see below), leading to
      increased tracking speed).
      Each REC is defined by 12 numbers:
      V_x, V_y, V_z (coordinates of the centre of one of the elliptical
      plane faces), H_x, H_y, H_z (x, y and z components of a vector
      corresponding to cylinder height, pointing to other plane face),
      R1_x, R1_y, R1_z (components of a vector corresponding to the minor
      half-axis of the cylinder elliptical base), R2_x, R2_y, R2_z
      (ditto for the major half-axis).
      A REC 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..
REC 1 -10.0 12.0 7.0 0.0 58.0 0.0 9. 0.0 0.0 0.0 0.0 17.0
* (an elliptical cylinder 58 cm long parallel to the y axis, with minor
* half-axis 9 cm long parallel to the x coordinate axis, major
* half-axis 17 cm long parallel to the z axis, base centreed at point
* x=-10, y=12, z=7)
The same example in high-accuracy body fixed format:
*...+....1....+....2....+....3....+....4....+....5....+....6....+....7....+.
REC 1 -10.0 12.0 7.0 0.0 58.0 0.0 9. 0.0 0.0 0.0 0.0 17.0 The same, in free format: REC pipesurf -10.0 12.0 7.0 0.0 58.0 0.0 9.0 0.0 0.0 0.0 0.0 17.0

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