Figure 3.  Correlation between frequency of the spectral maximum of microwave bursts f_m and the same parameter of proton energy spectra δ= lg (J₁₀/J₁₀₀). The rest is as in Fig. 1. The following events are marked by numbers: 60 – 20.02.2002, 63 –15.07.2002, 81 – 20.01.2005.