One example source G50.695−0.792 fitted with two indices. The top two panels show each SPW separately. The bottom left panel represents the averaged image of spw-1440 and spw-1820, which we used for the source extraction (see Sect. 3). The white contours show the extent of the source determined by the BLOBCAT algorithm. The cross in each panel marks the peak position, which we used to determine the spectral index. The bottom right panel presents the peak intensity for each SPW and corresponding one single spectral index fitting (black solid line) and two spectral indices fitting (green dashed lines) from two components (red and blue dashed lines).