Description
Table 2 contains the heliocentric radial velocity data versus Heliocentric Julian Day for six X-ray selected double-lined spectroscopic binaries in Orion. Of these, the four systems RXJ 0529.4+0041, RXJ 0530.7-0434, RXJ 0532.1-0732, and RXJ 0541.4-0324 are pre-main sequence systems. Table 3 contains the radial velocity data for the third components of the spectroscopic systems RXJ 0441.0-0839, RXJ 0529.4+0041, and RXJ 0532.1-0732
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