Rotational diagrams of the models given in Table 2 with G/D = 1000 and constant or jump abundance. Only lines above the detection limit of MIRI within 10 000 s (~10^-20 W m^-2) are shown. The x-axis shows the upper level energy E_u (K) and the y-axis the number of molecules, N_u = 4πd²F/ (A_ulhν_ulg_u), where d is the distance, F flux, A_ul Einstein-A coefficient, ν_ul transition frequency, and g_u the upper level degeneracy.