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Fig. 1
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Fits to the expanding cluster in simulations by least-squares. The dots are from different time nodes; i.e., t = 0 Myr, 1 Myr, 2 Myr, 3 Myr, and 4 Myr. Here, “k” is the slope of the linear fit with the unit pc/M⊙, and “r” represents the Pearson correlation coefficient.
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