Fig. 3
From: Statistical study of PMSE response to HF heating in two altitude regions
The distributions of ratios of different parameters R0, R1, R2 and R3 for case 1 of Table 1. In each panel, the horizontal dashed-dotted line indicates when the ratio is equal to 1. The asterisks represent the measurements at transmitter frequency 5.423 MHz, whereas the circles represent the measurements at 7.953 MHz. The vertical dash line is used to separate the measurements of X- and O-modes polarization