Comparison between spectral indices from Maron et al. (2000) and this work. Black circles indicate 35 pulsars with spectra best described with a single PL by Maron et al. (frequency range of 400 MHz–1.6/5 GHz) and a single PL in our work (frequency range of typically 100 MHz–5 GHz). The spectral indices in our work tend to be more flat, indicating a possible low-frequency turnover somewhere close to 100 MHz. For comparison, spectral indices for 21 pulsars with clearly identified low-frequency turnovers below the frequency range of Maron et al. (2000) are shown with orange circles.