[O III]88 emission line spectra of J2100–Q (top panel) and J2100–SB (bottom panel) after continuum subtraction. The red line shows the Gaussian fit (parameters reported in Table 1). In grayscale, we overplot the respective spectra of the [C II] line (after shifting to the same rest-frame velocity as the [O III]88), again after continuum subtraction. The [C II] spectrum has been scaled down in intensity by a factor of 2 (axis labels to the right).