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Table 1

Physical parameters of M 51 = NGC 5194.

Morphology SAbc
Position of the nucleus
δ(2000) = +47°11′42.59′′
Position angle of major axis −10° ( is north)
Inclination −20° ( is face on) a
Distance 7.6 Mpcb
Optical radius (R25) 3.9 (8.6 kpc)c

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