\begin{table}%t1
\caption{Observational parameters. Columns~1,~2: NGC, VCC or UGC designations. Columns~3,~4: coordinates (J2000) from GOLDMine and HyperLeda. Column~5: recessional velocities in km~s$^{-1}$ from GOLDMine and HyperLeda. Column~6: distances in Mpc, assigned following the subcluster membership criteria of \citet{gav99} or from the {\it Nearby Galaxies Catalogue} by \citet{tul94}. 
Column~7: galaxy inclinations in deg from GOLDMine and HyperLeda. Column~8: morphological types from GOLDMine and HyperLeda. Column~9: $H$-band luminosity in $L_\odot$ from GOLDMine or computed from $H$~magnitude from SIMBAD. Column~10: radius in arcsec at the $B$-band 25th~isophote from  HyperLeda. Column~11: density in Mpc$^{-3}$ for galaxies brighter than $-$16~mag in the vicinity of the galaxy considered, determined on a 3D-grid at 0.5~Mpc spacing \citep{tul94}. Column~12: reference to H$\alpha$~imaging: a~= \citet{bos02}; b~= \citet{koo01}; c~= \citet{bos02b}; d~= \citet{mar01}; e~= \citet{kna04}; f~= \citet{meu06}; g~= \citet{ken03}; h~= \citet{jam04}. Column~13: reference to metallicity: i~= \citet{ski96}; j~= GOLDMine; k~= \citet{ken03}; l~= \citet{van98}; m~= \citet{zar94}. Column~14: reference to HI~mapping: n~= THINGS; o~= VIVA; p~= \citet{cay90};  q~= \citet{ver01}. Column~15: reference to NIR/Visual imaging: r~= SDSS; s~= GOLDMine; t~= \citet{kuc00}; u~= \citet{mul97}.}\label{sample}
%\centering
\small
\begin{tabular}{c c c c r r c c c c c c c c c}
\hline
\hline
NGC &   Name  &RA       & Dec       & $cz$   & Dist.   &Incl.&	Type&   $H$ lum.   &  $r_{25}$   & $\rho$ &  H$\alpha$ & Met. & HI & Opt.\\
   &      & hhmmss       & ddppss      & km~s$^{-1}$   & Mpc   &deg&	 &      $L_\odot$   &  arcsec   &  Mpc$^{-3}$ &   & &   &  \\
 (1)   &  (2)     &  (3)    &  (4)      & (5)	& (6)  & (7) & (8)   & (9)         &(10)   & (11)   & (12) & (13) & (14)& (15) \\
\hline
 1068  &  U2188 & 024240.7&  --000048  & 1137 & 14.4 & 21 & SSb   &  11.14 & 185 & 0.34 &  d  &  l  &  --  &  r \\
 3184  &  U5557 & 101817.0&  +412528  &  593 & 8.7  & 24 & SABc  &  10.24 & 222 & 0.17 &  e  &  l  &  n  &  r \\
 3351  &  U5850 & 104357.7&  +114213  &  778 & 8.1  & 41 & Sb	 &  10.36 & 217 & 0.54 &  g  &  m  &  n  &  r \\
 3521  &  U6150 & 110548.5&  --000209  &  802 & 7.2  & 65 & SABb  &  10.63 & 249 & 0.19 &  f  &  m  &  n  &  r \\
 3627  &  U6346 & 112015.0&  +125929  &  721 & 6.6  & 57 & SABb  &  10.51 & 307 & 0.35 &  g  &  k  &  n  &  r \\
 4051  &  U7030 & 120309.6&  +443152  &  704 & 17   & 30 & SABb  &  10.57 & 147 & 1.06 &  e  &  --  &  q  &  r \\
 4102  &  U7096 & 120623.1&  +524239  &  845 & 17   & 58 & SABb  &  10.55 &  89 & 1.42 &  h  &  --  &  q  &  r \\
 4192  &  V0092	& 121348.3&  +145401  &  195 & 17   & 78 & Sb	 &  10.99 & 329 & 1.44 &  a  &  --  &  p  &  s \\
 4212  &  V0157 & 121539.3&  +135405  &  --85 & 17   & 49 & Sc	 &  10.34 &  84 & 1.44 &  b  &  --  &  --  &  r \\
 4254  &  V0307 & 121849.6&  +142459  & 2733 & 17   & 24 & Sc	 &  10.94 & 150 & 1.91 &  a  &  i  &  p  &  s \\
 4303  &  V0508 & 122154.9&  +042825  & 1912 & 17   & 35 & Sc	 &  10.98 & 207 & 1.06 &  a  &  i  &  p  &  s \\
 4321  &  V0596 & 122254.9&  +154921  & 1898 & 17   & 27 & Sc	 &  11.14 & 181 & 2.95 &  a  &  i  &  o  &  s \\
 4402  &  V0873 & 122607.5&  +130646  &  562 & 17   & 74 & Sc	 &  10.39 & 106 &   --  &  c  &  j  &  p  &  s \\
 4419  &  V0958 & 122656.4&  +150251  &   50 & 17   & 70 & Sa	 &  10.61 & 117 & 1.60 &  a  &  --  &  o  &  s \\
 4501  &  V1401 & 123159.2&  +142514  & 2606 & 17   & 58 & Sbc   &  11.18 & 189 & 2.04 &  a  &  i  &  o  &  s \\
 4535  &  V1555 & 123420.3&  +081152  & 2294 & 17   & 27 & Sc	 &  10.76 & 244 & 2.33 &  a  &  j  &  p  &  s \\
 4536  &  V1562 & 123427.1&  +021116  & 2147 & 17   & 63 & Sc	 &  10.71 & 212 & 0.43 &  a  &  j  &  o  &  s \\
 4548  &  V1615 & 123526.4&  +142947  &  804 & 17   & 34 & Sb	 &  10.91 & 165 & 2.82 &  a  &  --  &  p  &  s \\
 4569  &  V1690 & 123649.8&  +130946  &  106 & 17   & 62 & Sab   &  11.05 & 274 & 1.15 &  a  &  k  &  o  &  s \\
 4579  &  V1727 & 123743.5&  +114905  & 1844 & 17   & 40 & Sab   &  11.11 & 150 & 3.26 &  a  &  k  &  p  &  s \\
 4654  &  V1987 & 124356.6&  +130735  & 1357 & 17   & 59 & Sc	 &  10.66 & 140 & 2.93 &  a  &  i  &  o  &  s \\
 4689  &  V2058 & 124745.5&  +134546  & 1934 & 17   & 41 & Sc	 &  10.48 & 114 & 2.39 &  a  &  i  &  o  &  s \\
 4736  &  U7996 & 125053.0&  +410713  &  314 & 4.3  & 35 & Sab   &  10.45 & 233 & 0.42 &  e  &  m  &  n  &  r \\  
 5055  &  U8334 & 131549.3&  +420145  &  508 & 7.2  & 56 & Sbc   &  10.71 & 352 & 0.40 &  g  &  m  &  n  &  r \\  
 5194  &  U8493 & 132952.7&  +471142  &  461 & 7.7  & 30 & Sbc   &  10.84 & 233 & 0.33 &  g  &  m  &  n  &  r \\  
 5236  &  UA366 & 133700.9&  --295155  &  508 & 4.7  & 46 & Sc	 &  10.72 & 465 & 0.18 &  f  &  m  &  n  &  t \\  
 5457  &  U8981 & 140312.5&  +542056  &  237 & 5.4  & 22 & SABc  &  10.47 & 720 & 0.29 &  e  &  l  &  n  &  r \\  
 6951  &  U11604& 203714.0&  +660620  & 1424 & 24.1 & 52 & SABb  &  11.10 &  97 & 0.08 &  h  &  --  &  --  &  u \\  
\hline						\end{tabular}\end{table}