An ELL is a prolate (cigar-shaped) ellipsoid, obtainable by revolution of an ellipse around its major axis, and having any orientation in space. Each ELL is defined by 7 numbers: F1_x, F1_y, F1_z, F2_x, F2_y, F2_z, (coordinates of the two foci on the major ellipsoid axis), L (full length of the major axis). An ELL definition extends over 2 cards in default fixed format, or over 3 cards in high-accuracy body fixed format. Example in default fixed format:*...+....1....+....2....+....3....+....4....+....5....+....6....+....7..ELL 003 -400.0 0.0 0.0 400.0 0.0 0.0 1000.* (an ellipsoid obtained by revolution around the x axis of an ellipse* centred at the origin, with major axis parallel to x 1000 cm long and* minor axis 600 cm long).The same example in high-accuracy body fixed format:*...+....1....+....2....+....3....+....4....+....5....+....6....+....7....+.ELL 003 -400.0 0.0 0.0 400.0 0.0 0.0 1000. The same, in free format: ELL TheCigar -400.0 0.0 0.0 400.0 0.0 0.0 1000.0