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Fig. 14.

Fig. 14. Refer to the following caption and surrounding text.

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Schematic of the nested, asymmetric circumstellar medium around SN 2024abvb. Left: the projected geometry of concentric He/C/O toroidal shells at differing orientations, together with the co-located diffuse H-rich envelope. Right: the observed polarimetric evolution, with epoch-coloured markers indicating which shell geometry dominates the scattering at each phase.

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