**Table 4:** Estimated parameters of the central H I disc in NGC 4441.
Estimated parameters
Disc extent ( $^{\prime\prime}$ )	60
Max. velocity (km s^-1)	163
Position angle ( $^\circ$ )	-35
Inclination ( $^\circ$ )	70
$M_{\rm dyn}$ ( $10^{10}~M_{\odot}$ )	6.4
$M_{\rm HI}/M_{\rm dyn}$	0.028
$M_{\rm dyn}/L_{\rm B}$ ( $M_{\odot}/L_{\rm B,\odot}$ )	6.3

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