RGS spectrum of ESO 141-G55 from 2022. Top panel: Fluxed spectrum over the full RGS bandpass. The solid red line corresponds to the baseline absorbed power-law continuum, and the vertical dotted lines mark the wavelengths of the emission lines. Bottom panel: Zoom-in on the O VII emission band (binning of Δλ = 0.1 Å). The broad component at 21.6 Å corresponds to the resonance line, and the narrow component at 22.1 Å corresponds to the forbidden line. The O I absorption line is due to our Galaxy.