Line profiles of the atomic and molecular lines observed with SPIRE-FTS in the western rims of the Helix nebula. To reduce the sidelobes, the spectra were apodized with an extended Norton-Beer function (FWHM = 15′′) to a resolution of 0.072 cm-1. Bottom right: the spectral lines are observed at four positions along the western rims, two positions in the inner rim (B in red, C in blue), and two positions in the outer rim (A in black, D in green).
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