PVD for Lyα, Hα and three optical FELs. For comparison, the contour lines for [S ii] 6731 Å are overlaid in all panels. Left: the Lyα line is contaminated by airglow close to the rest velocity. Right: the optical lines show scattered light close to the central star despite the occulting bar. These areas are shaded. [O i] 6300 Å is located close to the edge of the chip, so no data exists in the bottom left of the PVD. Contour lines are drawn for [S ii] 6731 Å at the level 7 × 10^-16 erg s^-1 Å^-1 cm^-2 arcsec^-2. The optical PVDs are background-subtracted (see text). The following wavelength intervals are used to fit the background: [O i] 6300 Å: 6352–6357 Å, and 6376–6382 Å; Hα: 6504–6524 Å, and 6604–6624 Å; [S ii] 6716 Å: 6705–6708 Å, and 6721–6724 Å; [S ii] 6731 Å: 6721–6723 Å, and 6735–6738 Å. (This figure is available in color in electronic form.)