HR diagram for our sources. Symbol size corresponds to M < 4, 4 ≤ M < 6, 6 ≤ M < 8, M ≥ 8M⊙, from smaller to larger, respectively. The dashed lines(from bottom to top) are the PMS tracks for 1, 2 , 3, 4, 5, 6, and 7 M⊙, the filled line is the ZAMS. Blue and red symbols are, respectively, EGOs and non-EGOs.
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