Absorption spectra at t/t_cc = 1.2 of ions tracing the cold phase of the gas generated with light rays passing through the centre (in blue), 5 pc from the centre along the x- (dashed orange line) and z-axis (solid orange line), and 15 pc from the centre along the x- (dashed green line) and z-axis (solid green line). In this figure, we display in the upper left panel the absorption profiles of the C II in the simulation R32-AL, in the upper right panel the C II in R32-TR, while the lower panels show the lines of the Si II in the simulation R32-AL (left) and R32-TR (right).