Number of individual detectable species as a function of the flux density level relative to the brighter transitions detected in the survey per band. Left: flux density levels are referred to the CO 3 − 2 (112 Jy beam⁻¹) as the brightest transition detected in the whole spectral range covered. Right: flux densities are referred to the brightest transition detected on each band. This is CS 3 − 2 (0.9 Jy beam⁻¹ in Band 4), HCO⁺ 2 − 1 (3 Jy beam⁻¹ in Band 5), CO 2 − 1 (56 Jy beam⁻¹ in Band 6), and CO 3 − 2 (in Band 7).