Comparison between the RRL peak velocity and median methanol maser velocity. Top: the RRL peak velocity is plotted against the median methanol maser velocity. Sources with a positional offset between the H II region and methanol maser of less than 6″ are depicted using blue circles, while sources with a positional offset greater than 6″ but less than 12″ are represented by red circles. The dashed black line represents the line of equality, x=y, with a Spearman’s rank coefficient of r = 0.98 and p-value ≪ 0.0013. Bottom: the distribution of velocity offsets between the RRL peak velocities and median methanol maser velocity is shown. Fitting the distribution with Gaussian yield a mean of 0.5 ± 0.3 km s⁻¹ and standard deviation of 4.0 ± 0.34 km s⁻¹.