Fig. 2
The average variations of the four monitoring parameters within 6 h in FB1 (35.622 ± 5 MHz), FB2 (59.836 ± 5 MHz) and FB3 (189.141 ± 5 MHz). a is RA and b represents RP. The results of TA and TP are shown in c and d, respectively. The variation trends of monitoring parameters over time in different frequency bands are drawn by three colors (green, red and blue)