Example of Gaussian fitted GLOSTAR stacked recombination line corresponding to the peak emission toward W33 Main (left panel) and G12.81−0.22 (right panel). Toward the peak emission of W33 Main, the line amplitude, line width, and velocity were found to be 622 ± 8.6 mJy beam⁻¹, 39.3 ± 0.6 km s⁻¹, and 36.7 ± 0.3 km s⁻¹, respectively. For G12.81−0.22, toward the peak emission, the line amplitude, line width, and velocity were found to be 79.1 ± 2.9 mJy beam⁻¹, 20.4 ± 0.9 km s⁻¹ and 30.2 ± 0.4 km s⁻¹, respectively.