Dynamical age vs. size relation derived for H II regions in the LMC (red symbols, Ambrocio-Cruz et al. 2016) is compared to the age vs. size relation derived from SED fitting for the extraplanar H II regions inNGC 4254 (black filled dots). The vertical dashed line indicates the limiting seeing of the r- and narrow-band images. The black solid line shows the best fit for H II regions in the LMC: log(age) = 0.86(±0.03) × log(Diameter) −1.58(±0.06), R2 = 0.88.
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