Scatter plot of the type III radio flux at four frequencies versus non-thermal HXR-producing electrons above 20 keV. The number of events for which type III emissions were detected at higher frequencies is indicated and is observed to progressively decrease. The blue points indicate the events that were observed by RHESSI and the red points are the events that were observed by Fermi GBM. Correlation coefficients are 0.38, 0.37, 0.28, and 0.18 for radio frequencies 164 MHz, 228 MHz, 327 MHz, and 432 MHz, respectively.