Fig. 8
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PSF residual maps. Panel a: total PSF residual in 2019. Panel b: total PSF residual in 2021. Panel c: PSF residual in 2019 at the position of [NII] λ 6583. Panel d: PSF residual in 2021 at the position of [NII] λ 6583. The path of [NII] λ 6583 intensity is highlighted by the edges in the [NII] λ 6583 contours displayed in Figs. 1 and 5, marking the detection within the ISM across all four panels.
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