\begin{table}%t1 %\centering \par \caption{Basic properties of the examined galaxies. (1) \citet[][]{Vaucouleurs91}; (2) \citet[][]{Freedman01}; (3) This work; (4) NED; (5) LEDA \citep[][]{LEDA}. \label{Tab_3.1}} \begin{tabular}{llrrrr} \hline \hline Descr. & Par. & NGC~2541 & UGC~3580 & NGC~5204 & Ref. \\ \hline Classification of galaxy & Type & SA(s)cd & SA(s)a & SA(s)m & (1) \\ Right Ascension (J2000) (NED) & RA & $\hmsm{08}{14}{40}{07}$ & $\hmsm{06}{55}{30}{86}$ & $\hmsm{13}{29}{36}{51}$ & (4) \\ Declination (J2000) (NED) & Dec & $\dmsm{+49}{03}{41}{2}$ & $\dmsm{+69}{33}{47}{0}$ & $\dmsm{+58}{25}{07}{4}$ & (4) \\ Optical heliocentric systemic velocity ($\rm km~s^{-1}$) & $V_{\rm sys}$ & $559.5 ~\pm~ 2.0$ & $1200.1 ~\pm~ 2.0$ & $200.8 ~\pm~ 2.0$ & (3) \\ Distance of object ($\rm Mpc$) & $\rm D$ & $11.2 ~\pm~ 0.8$ & $15.1 ~\pm~ 3.5$ & $4.1 ~\pm~ 1.0$ &(2,3) \\ Scale between distance on sky and true distance ($~^{\prime\prime}~{\rm pc}^{-1}$). & $sc$ & $54.4 ~\pm~ 3.9$ & $73 ~\pm~ 17$ & $20.0 ~\pm~ 4.8$ & (3) \\ Apparent $B$-band magnitude ($\rm mag$). & $m_{\rm B}$ & $12.36 ~\pm~ 0.34$ & $13.87 ~\pm~ 0.35$ & $11.71 ~\pm~ 0.12$ & (5) \\ Apparent $I$-band magnitude ($\rm mag$). & $m_{\rm I}$ & $10.86 ~\pm~ 0.06$ & $11.55 ~\pm~ 0.08$ & $9.79 ~\pm~ 0.10$ & (5) \\ Extinction-corrected apparent $B$-band magnitude ($\rm mag$). & $m_{\rm B}^{\rm c}$ & $11.60 ~\pm~ 0.34$ & $13.34 ~\pm~ 0.35$ & $11.30 ~\pm~ 0.12$ & (4) \\ Extinction-corrected apparent $I$-band magnitude ($\rm mag$). & $m_{\rm I}^{\rm c}$ & $10.57 ~\pm~ 0.07$ & $11.25 ~\pm~ 0.09$ & $9.71 ~\pm~ 0.10$ & (3) \\ Absolute $B$-band magnitude ($\rm mag$). & $M_{\rm B}$ & $-18.6 ~\pm~ 0.4$ & $-17.6 ~\pm~ 0.6$ & $-16.8 ~\pm~ 0.5$ & (3) \\ Absolute $I$-band magnitude ($\rm mag$). & $M_{\rm I}$ & $-19.7 ~\pm~ 0.2$ & $-19.6 ~\pm~ 0.5$ & $-18.4 ~\pm~ 0.5$ & (3) \\ $B$-band luminosity ($10^9~ {L}_\odot$). & $L_{\rm B}$ & $4.5 ~\pm~ 1.6$ & $1.64 ~\pm~ 0.92$ & $0.81 ~\pm~ 0.39$ & (3) \\ $I$-band luminosity ($10^9~ {L}_\odot$). & $L_{\rm I}$ & $3.20 ~\pm~ 0.50$ & $3.1 ~\pm~ 1.5$ & $0.96 ~\pm~ 0.46$ & (3) \\ Total {\ion{H}{i}} flux (${\rm Jy}~{\rm km}~{\rm s}^{-1}$). & $F_{\rm {\ion{H}{i}}}$ & $142 ~\pm~ 15$ & $41.6 ~\pm~ 4.2$ & $135 ~\pm~ 14$ & (3) \\ {\ion{H}{i}} mass ($10^9~{M}_\odot$). & $M_{\rm {\ion{H}{i}}}$ & $4.23 ~\pm~ 0.74$ & $2.2 ~\pm~ 1.1$ & $0.54 ~\pm~ 0.27$ & (3) \\ $B$-band optical radius ($~^{\prime\prime}$). & $r_{25}$ & $173 ~\pm~ 61$ & $97 ~\pm~ 28$ & $140 ~\pm~ 10$ & (5) \\ {\ion{H}{i}} radius ($~^{\prime\prime}$). & $r_{\rm {\ion{H}{i}}}$ & $420 ~\pm~ 30$ & $240 ~\pm~ 30$ & $240 ~\pm~ 30$ & (3) \\ Terminal radius ($~^{\prime\prime}$). & $r_{\rm t}$ & $590 ~\pm~ 30$ & $375 ~\pm~ 30$ & $420 ~\pm~ 30$ & (3) \\ $B$-band optical radius ($\rm kpc$). & $R_{25}$ & $9.39 ~\pm~ 0.67$ & $7.1 ~\pm~ 1.7$ & $2.82 ~\pm~ 0.66$ & (5) \\ {\ion{H}{i}} radius ($\rm kpc$). & $R_{\rm {\ion{H}{i}}}$ & $22.9 ~\pm~ 1.7$ & $17.6 ~\pm~ 4.1$ & $4.8 ~\pm~ 1.2$ & (3) \\ Terminal radius ($\rm kpc$). & $R_{\rm t}$ & $32.1 ~\pm~ 2.3$ & $27.5 ~\pm~ 6.4$ & $8.4 ~\pm~ 2.0$ & (3) \\ Rotation velocity at terminal radius (${\rm km}~{\rm s}^{-1}$). & $V_{\rm t}$ & $127 ~\pm~ 25$ & $121 ~\pm~ 17$ & $105 ~\pm~ 25$ & (3) \\ Rotation period at terminal radius (${\rm Gyr}$). & $t_{\rm t}$ & $1.55 ~\pm~ 0.04$ & $1.39 ~\pm~ 0.04$ & $0.49 ~\pm~ 0.03$ & (3) \\ Dynamical mass ($10^9~{M}_\odot$). & $M_{\rm dyn}$ & ${>} 121 ~\pm~ 49$ & $>\ 94 ~\pm~ 34$ & $>$$22 ~\pm~ 12 & (3) \\ Ratio of {\ion{H}{i}} mass and B-band luminosity ({M}_\odot~{L}_\odot^{-1}). & \frac{M_{\rm {\ion{H}{i}}}}{L_{\rm B}} & 0.9 ~\pm~ 0.2 & 1.4 ~\pm~ 0.23 & 0.7 ~\pm~ 0.07 & (3) \\ Ratio of {\ion{H}{i}} mass and I-band luminosity ({M}_\odot~{L}_\odot^{-1}). & \frac{M_{\rm {\ion{H}{i}}}}{L_{\rm I}} & 1.3 ~\pm~ 0.2 & 0.7 ~\pm~ 0.08 & 0.6 ~\pm~ 0.06 & (3) \\ Ratio of dynamical mass and {\ion{H}{i}} mass. & \frac{M_{\rm dyn}}{M_{\rm {\ion{H}{i}}}} & {>} 29 ~\pm~ 4 & {>} 42 ~\pm~ 12 & >$$ 40 ~\pm~ 11$ & (3) \\ Ratio of dynamical mass and $B$-band luminosity (${M}_\odot~{L}_\odot^{-1}$). & $\frac{M_{\rm dyn}}{L_{\rm B}}$ & $>$$27 ~\pm~ 12 & >$$ 57 ~\pm~ 23$ & ${>} 27 ~\pm~ 15$ & (3) \\ Ratio of dynamical mass and $I$-band luminosity (${M}_\odot~{L}_\odot^{-1}$). & $\frac{M_{\rm dyn}}{L_{\rm I}}$ & ${>} 38 ~\pm~ 16$ & ${>} 30 ~\pm~ 12$ & ${>} 23 ~\pm~ 13$ & (3) \\ \hline \end{tabular} \end{table}