Spatially resolveed properties of the face-on galaxy NGC4321. Left panel: IRAC/Spitzer view of NGC4321. The map at 3.6 μm highlights the diffuse stellar emission around the disk and shows the structure of the spiral arms. Central panel: HI emission from the public VIVA database. The maps are reported in the same astrometric system. The open squares mark the position of the galaxy cells building the quenched ring, and they have a size of 8″ × 8″. Right panel: The H2 gas phase for NGC4321 is traced by the CO emission from the HERACLES survey. Each image is presented at the native angular resolution (Spitzer = 1.6″, HI = 15″, CO = 11″).