Observed transitions of NCO in the ²Π_3∕2 state towards L483. The strongest components of the J = 7∕2 − 5∕2 and J = 9∕2 − 7∕2 transitions are shown in the upper and lower panels, respectively. The LTE results are overplotted in red. We note that the absorption feature in the lower panel between the doublet F = 7∕2 − 5∕2 is not real, it is the corresponding negative of the C₄H line due to the frequency switching observing mode (located 7.2 MHz away).