Spectrum of filament F1 in the vicinity of SNR 0540-69.3. The filament is situated only 8″ west of the pulsar (see Figs. 1 and 2). As in Figs. 11 and 12, we have also plotted the spectra with expanded flux scales to highlight weaker lines. The spectrum was dereddened using E(B − V) = 0.19 and R_V = 3.1. We note that the broad base of the [O III] λλ4959,5007 lines is skewed to the red as compared to the narrow components, reaching at least +1700 km s⁻¹. No such features are seen in spectra of the emission from filaments F2, F3, F4, or F5 (see Fig. 14), as marked in Fig. 1. Line fluxes of all filaments are given in Tables 3 and 4.