Radio continuum emission of the new maser-emitting PN (indicated with an asterisk next to its name) and candidates (rest of the panels), including the new flux density values at 24.5 GHz from our VLA observations in the previously reported OHPN candidates IRAS 17494–2645 and IRAS 18019–2216 (Cala et al. 2022). The source names and obtained spectral indices (α) are indicated in each panel. Black circles are data from our ATCA/VLA observations. Blue circles are data from the literature which, together with the black circles, were employed to fit the spectral indices. Red circles correspond to values from epochs earlier than the blue and black ones, except for IRAS 18464–0140, where the point at 10 GHz is from a more recent epoch. Thus, these red points were not used in the spectral index fits, since they were obtained at a significantly different epoch. See the text for more details.