Correlation of the CO[5–4] line luminosity with the bolometric IR luminosity (L_IR; 8–1000 μm) of our four BzK galaxies at z = 1.5. When we include the sample of galaxies from Fig. 11 (solid symbols) and additional SMGs and (U)LIRGs (crosses; see text), we observe a virtually linear correlation between the luminosities (solid line, while the dashed line is the nonlinear fit), spanning about four orders of magnitude along both axes. The average ratio of the BzK galaxies is consistent with the average of the ratio of local (U)LIRGs or high-z starbursting SMGs.