Radio bursts observed on February 22, 2003 at six frequencies 15.40, 8.80, 4.99, 2.69, 1.41, and 0.61 GHz by RSTN. The dashed vertical line at 09:29 UT marks the time of the GOES soft X-ray flare maximum. The heavy black line denotes the time interval with the parameter n ≥ 5 determined from RESIK and the heavy grey line represents time intervals with n < 5. The short black line denotes the time interval when groups of dm-type III bursts were observed, see Fig. 6.