Fig. 4
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PN and PO spectra. Top: PN N = 2–1 spectrum at the peak of the PN spatial distribution. The vertical dot-dashed line marks the systemic velocity of L1157-mm. Bottom: PO emission at the peak of the spatial distribution obtained by stacking the lines 2Π1/2 J = 5/2–3/2, F = 3–2 f and 2Π1/2 J = 5/2–3/2 F = 3–2 e. Intensities are expressed in TB scale.
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