Top: spatial distribution of the peak temperature (left) and integrated intensity (right) of the CO(2–1) line over the full observed field of view of NGC 628. The color scales a dynamic range of the peak temperature and integrated intensity, saturated to high intensity of 3.6 K and 45 K km s⁻¹, respectively. The white square shows the position of the headlight cloud in NGC 628 (see the left part of Fig. 2 for a magnification). Offset positions are from the galactic center, α: 01^h36^m4172, δ: +15°46′593 J2000. The beamsize is shown in the bottom left corner of the left panel. Bottom: number of pixels whose CO(2–1) peak temperature T_CO (black curve) and integrated CO(2–1) intensity W_CO (blue curve) are above the value given in the bottom abscissa for T_CO and in the top abscissa for W_CO, for the entire galaxy. Shown is the full range of values in logarithmic scale (left) and the zoomed-in linear scale (right). The red dashed lines show the values corresponding to 100 pixels (or a surface of about 2″ × 2″) in the CO map.