Continuum emission images of the inner ≲3 pc. From left to right: central 80′′ at 100 GHz, central 40′′ at 250 GHz with 100 GHz contours of [6, 12, 24, 48, 96, 144, 192, 384, 1920, 4800] ×σ (=0.5 mJy beam^-1), and central 20′′ at 340 GHz with 250 GHz contours of [6, 12, 24, 36, 48, 72, 96, 144, 192, 1920, 19200] ×σ (=0.21 mJy beam^-1). The beam sizes are 1.8′′× 1.5′′, 0.7′′× 0.6′′, and 0.5′′× 0.4′′, respectively.