The satellite spectra arising due to the L 3 M x -M x N 4,5 (x = 1-5) transition array in the X-ray emission spectra of 72 Hf, 73 Ta, 74 W, 81 Tl, 83 Bi and 92 U have been calculated using available HFS data on K-LM and L-MN Auger transition energies. The agreement between the calculated and measured energies, that between calculated and measured separations in energies and the consideration of the relative probabilities of all the L 3 M x -M x N 4,5 transitions have been used as the basis for deciding the origin of the satellites. It has been established that two satellites observed in the Lb 2 region of the X-ray spectra of various elements, named b 2 I and b 2 II in the order of increasing energy, are mainly emitted by the L 3 M 4,5 -M 4,5 N 4,5 transitions. It is observed that satellite b 2 I in the spectra of elements with 72 Hf to 74 W has been assigned to the superposition of the 3 F 4 -3 G 5 and 3 F 4 -3 D 3 transitions and must be the most intense one among all these satellites. The same transition has been proved to be the main origin of satellite b 2 II , reported in the element with 81 Tl, 83 Bi and 92 U. Further, satellite b 2 I , reported in the spectra of elements with 81 Tl and 92 U, has been associated with the transitions 3 D 3 -3 F 4 and 1 D 2 -1 F 3 . Finally, line b 2 II , reported in the spectra of elements with Z = 72-74, has been assigned to the 1 F 3 -1 G 4 and 3 P 0 -3 D 1 transitions. The possible contributions of other transitions of the L 3 M x -M x N 4,5 (x = 1-5) array having intensities comparable with those of the above transitions, as well as the corresponding lines that have not yet been observed, have also been discussed.