**Table 3:** The H I properties of the total system, the tails and the central disc of NGC 4441. Heliocentric velocities are given.
H I properties
Total system
$v_{\rm opt,hel}$ (km s^-1)	2674
vel. range (km s^-1)	2580-2900
$F_{\rm HI}$ (Jy km s^-1)	4.83
$M_{\rm HI}$ (10⁹ $M_{\odot}$ )	1.46
$M_{\rm HI}$ / $L_{\rm B}$	0.82
Central ring
major axis ( $^{\prime\prime}$ , kpc)	32, 5.5
minor axis ( $^{\prime\prime}$ , kpc)	19, 3.4
$M_{\rm HI}$ (10⁸ $M_{\odot}$ )	4.2
Northern tail
vel. range (km s^-1)	2700-2820
extent (centre-tip) ( $^\prime$ , kpc)	4.6, 48
centre - clump ( $^\prime$ , kpc)	1.5, 16
$M_{\rm HI}$ (10⁸ $M_{\odot}$ )	2.1
Southern tail
vel. range (km s^-1)	2580-2640
extent (centre-tip) ( $^\prime$ , kpc)	4.0, 42
centre - clump ( $^\prime$ , kpc)	1.7, 18
$M_{\rm HI}$ (10⁸ $M_{\odot}$ )	3.4

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