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Published online by Cambridge University Press: 03 August 2017
NGC 4736 is one of the nearest examples (D ≈ 6.3 Mpc) of spiral galaxies with prominent rings : an inner ring of HII regions (r ≈ 50″ ≈ 1.7 kpc) and an outer stellar and HI ring (r ≈ 5′ ≈ 9 kpc. Atomic gas is present in the inner ring, and throughout the main body of the galaxy, but neither in the nucleus nor in the gap between the main body and the outer ring.