[C II] surface brightness density vs. star formation rate surface density observed in regions from star-forming nearby galaxies from the KINGFISH sample (contours enclose 95%, 45%, and 25% of the 3846 regions; Herrera-Camus et al. 2015), nearby starbursts from the SHINING sample (gray circles; Herrera-Camus et al. 2018a), and the four regions in HZ4 in which we detect the dust continuum with ALMA (orange circles). The black line shows the best fit (and ±1σ scatter) to the KINGFISH regions (Herrera-Camus et al. 2015).