Non-resonant fine-structure emission lines detected in ID53 (except for Si II, which is not shown). Vertical green lines mark the positions of the emission lines, and red lines mark the expected positions of absorption lines at their rest-frame velocity. The blue shaded region shows the fitted Gaussian profiles of the emission lines and their uncertainties. The dashed red line shows the underlying stellar continuum from the best-fit model with a single-burst SFH. We note that skyline contamination impacts the C II* line profile.