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Fig. 1.

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Chandra X-ray images of three type Ia SNRs with evident ear-like structures in opposite directions. Panel (a): Kepler’s SNR(Reynolds et al. 2007). Panel (b): SNR G1.9+0.3 (Borkowski et al. 2013). Panel (c): SNR G299.2-2.9 (Park et al. 2007).

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