Fig. 7
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Comparison of emission and physical properties between the 2019 and 2021 epochs. Panel a: differences in [NII] λ 6583 between the two epochs. Panel b: difference in electron density measured in 2019 and 2021. Panel c: difference in extinction measured in 2019 and 2021. Panel d: difference in [NII] λ 6583 radial velocities measured in 2019 and 2021. 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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