Panel a: AIA 94 Å image at 18:56:59 UT showing the flaring region. The EUV flux tube system is partly occulted by the preexisting cool filament (a horizontal absorption feature). Thin colored contours represent 20% of EOVSA microwave brightness at four frequencies indicated in the legend. The thick red contour shows 20% level of the soft X-ray source observed by Hinode/XRT (Be-thick filter) at 18:56:25 UT. Panel b: Total emission measure of the flare region, with the thin green contour marks the region of enhanced thermal density at the levels of 3.6 × 10¹⁰ cm⁻³ and 8 × 10¹⁰ cm⁻³, as shown in the bottom panel of Fig. 7. Given the peak EM value of ∼2 × 10³¹ cm⁻⁵ and a loop depth of ∼20″ (∼14 Mm, roughly matching the spatial scale in the plane of the sky), the inferred peak electron density is approximately 1.2 × 10¹¹ cm⁻³, consistent with the n_th values inferred from the microwave spectral fitting and shown in panel (c); this is also the same as the one shown in the bottom panel of Fig. 7. Note: most of the individual EOVSA images (contours in panel a) do not have loop shapes matching EUV loops; however, the thermal number density inferred from the multifrequency spectral fitting reveals a loop-like structure (shown in panel c), matching the AIA-derived EM map in panel b.