Observed properties of G016.648−00.357 (i.e., Sh 2-48). (a) Effelsberg 4.89 GHz Stokes I image overlaid with the GDIGS RRL integrated-intensity contours. (b) TT plot between 4.89 GHz and 6.82 GHz at a common angular resolution of 2^′.65. The dashed red line shows the best fit to the observed data points. (c) Spatial distribution of the derived electron temperatures overlaid with the GDIGS RRL integrated-intensity contours. In panels (a) and (c), the integrated velocity ranges from 0 to 70 km s⁻¹ for the GDIGS RRL integrated intensity contours, starting at 1 K km s⁻¹ and increasing by 0.5 K km s⁻¹. The location of the exciting star BD−14 5014 is marked with a gold star. In each panel, the beam is shown in the lower-left corner, and the scale bar in the top-right corner is based on an assumed distance of 3.8 kpc (e.g., Ortega et al. 2013; Torii et al. 2021).