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Fig. 4.
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Large-scale Hα images of NGC 3628, NGC 5077, NGC 5363, and NGC 5813. The largest contours indicate the 1σ level over the background signal, except for NGC 5363, where it represents 3σ. The corresponding images on a smaller scale (∼10″ × 10″) with the 3σ detection are shown in Appendix B.
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