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Fig. 12.

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Time-span-weighted histograms showing the distribution of SNR directions for asymmetric SNRs. Distributions of oblate (prolate) SNRs are colored orange (violet). For oblate (prolate) SNRs, we show the direction of the minor (major) axis. We show the polar direction normal to the disk plane and the pitch angle relative to the direction of galactic rotation. We do not differentiate between directions above or below the disk. Positive pitch angles point between the galactic center and negative angles point towards the galactic outskirts. Orange and purple squares depict the directions of the minor and major axes of the LB, respectively, derived from the 3D dust maps of Edenhofer et al. (2024). The 1σ-ranges for the LB are also indicated as shaded areas in the one-dimensional histograms. Oblate SNRs tend to point vertically out of the disk and towards the galactic outskirts with a typical pitch angle of αminor ≲ −50 deg. On the other hand, prolate SNRs tend to lie within the disk plane |cos(θ)| ≲ 0.5 pointing slightly towards the galactic center αmajor ∼ 10 − 60 deg.

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