Slices of simulated CONCERTO data cubes. These cubes are produced using a Gaussian beam and have no instrumental noise. Each slice has a 1 GHz width. The four columns, from the left to the right, correspond to 305 GHz (z_[CII] = 5.23, Δz_[CII] = 0.020), 275 GHz (z_[CII] = 5.91, Δz_[CII] = 0.025), 245 GHz (z_[CII] = 6.75, Δz_[CII] = 0.032), and 215 GHz (z_[CII] = 7.83, Δz_[CII] = 0.041). Five rows, from top to bottom: the cubes containing all the components, including the continuum, all the lines, the CO lines only, the [CI] lines, and the [CII] line. To make comparisons easier, the color scale of the four panels with continuum (top row) is the same. All the other panels share another common color scale. We assume the DL14 [CII]-SFR relation in this figure.