Post-impulsive phase of the C4.0 flare event observed in X-ray and radio. (a) Normalized time profiles of GBM/Fermi X-ray count rates in three energy bands in the 6–25 keV range and STIX X-ray count rates in two energy bands in the 6–14 keV range (solid red and dotted blue curves, respectively). (b) ORFEES radio dynamic spectrum. (c) to (f) time evolution of the 1D projection images obtained with the NRH at 228 and 408 MHz in the east-west (EW) and north-south (NS) directions. The 5 black (or white) long dashed lines throughout (a) to (f) are five important times for the data analysis of the event. The times are 14:15:25 UT (marked as the time of T₁), 14:20:25 UT (time T₂), 14:24:42 UT (time T₃), 14:32:52 UT (time T₄), and 14:36:55 UT (time T₅), respectively.