NOEMA spectrum of the redshifted [C II] emission line and the underlying continuum in J1342+092, extracted from the peak pixel in the datacube. The bin size is 40 MHz, which corresponds to ∼54 km s−1. The dotted lines indicate +σ and −σ, with σ being the noise in each bin. The red, solid line is a flat continuum plus Gaussian fit to the spectrum (the fit values are reported in Table 1).