Plasma frequency as a function of heliocentric distance observed by the BELLA multilateration of the Type III SRB and compared against a 1/R² projection of STEREO A in situ electron density data (presented as histograms). Also shown are the harmonic and fundamental values given by the Saito and LeBlanc density models at 1 au. BELLA electron densities are higher than the expected electron densities obtained from models. The highest outliers of the harmonic emission derived from STEREO A in situ data are consistent with BELLA multilaterated sources. An alternative reason for these higher than expected electron densities is scattering (Chen et al. 2023; Kontar et al. 2023).