Spatially resolved microwave spectral analysis for Phase 1. Panel a displays the AIA 1600 Å maps overlaid with 25% contours from the EOVSA microwave map, ranging from 3.5−18 GHz, captured at 17:31:08 UT (corresponding to peak No. 5 in Table 1). The five distinct boxes mark regions selected for spectral fitting. Panel b illustrates the brightness temperature spectra from the five regions at 17:31:08 UT. Spectra are colour-coded to match the boxes in panel a. The colour-matching curves (in green and orange colours) represent best-fit models derived from homogeneous gyrosynchrotron emission due to non-thermal electrons with a single power-law distribution. The open circles denote data points excluded for the spectral fit. Panels c and d provide EOVSA spatially resolved time profiles from the five chosen regions, each averaged over specific frequency ranges. Panel c emphasises the range 3.5−5.8 GHz, as highlighted by the green shaded area in panel a, with a median frequency of 4.7 GHz. Similarly, Panel d highlights the frequency band in the range of 8.4−11.3 GHz marked by the yellow shading in panel a, with a median frequency of 9.9 GHz.