\begin{table}%T3
\caption{\label{tabella3}The selected Cepheid sample. }
%\centerline
{
\begin{tabular}{c c c c c c c c c c }
\hline
\hline
Cepheid& Period & Photometry & Rad. Vel. &~$\Delta (Ph-RV)$ & Cepheid & Period & Photometry & Rad. Vel.&~$\Delta (Ph-RV)$  \\
 &days & source & source&cycles & &days & source & source&cycles \\
\hline
FF Aql      &4.470840 &AFGR &BMS    &1142&YOph     &17.126780 &AFGR & GSSRGA&46\\
FM Aql      &6.114334 &AFGR &GSSRGA &89  &AW Per   & 6.463589 &FM   & GSSRGA&422\\
FN Aql      &9.481614 &AFGR &GSSRGA &56  &V440 Per & 7.572712 &Eg   & GSSRGA&131\\
$\eta$ Aql  &7.176779 &FM   &BMS    &413 &CM Sct   & 3.916977 &AFGR &M CMS, B&463\\ 
TT Aql      &13.75551 &AFGR &GSSRGA &81  &EV Sct   & 3.090998 &AFGR &BBMD, MCMS&586\\
U Aql       & 7.024100 &AFGR &BMS    &674 &RU Sct   & 19.70062 &AFGR & MCMS&92\\    
V496 Aql  &6.807164 & AFGR & G &643  &SS Sct   & 3.671280 &AFGR & BMS, G&1194\\
V600 Aql &7.238748 & AFGR & GSSRGA &156 &V367 Sct & 6.29307  &AFGR & MCMS&317\\
RT Aur   & 3.728561  & FM   &GSSRGA &216  &Y Sct    &10.341650 &AFGR &BMS&421\\
RX Aur   & 11.623537 & FM   &I &271    &BQ Ser   &4.316700  &AFGR &GSSRGA&926\\GI Car  & 4.431035  & Eg   &G &--     &S Sge    &8.382044  &FM   &GSSRGA&209\\
SU Cas  & 1.949322  & FM   &GSSRGA&--  &AP Sgr   &5.0574269 &AFGR &BMS, G&864 \\TU Cas  & 2.139298  & FM   &GSSRGA&--  &BB Sgr   &6.637115  &AFGR &GSSRGA&166\\~$\delta$ Cep& 5.366316  & FM   &BBMD &393&U Sgr    &6.745363  &AFGR &GSSRGA&81\\   
DT Cyg      & 2.499086  & AFGR &GSSRGA&2203  &V350 Sgr &5.154557  &AFGR &GSSRGA&157\\  
SU Cyg      & 3.845733  & AFGR &BMS&1432     &X Sgr    &7.012630  &AFGR &WCB&759\\  
X Cyg       & 16.386130 & AFGR &BBMD&244    &Y Sgr    &5.773400  &AFGR &BMS, WCB&885\\
VZ Cyg      & 4.864504  & FM   &BBMD&50    &YZ Sgr   &9.553606  &AFGR &BMS&419\\   
BG Cru      & 3.342503  & Eg   &E&943 &W Sgr    &7.595080  &AFGR &BBMD&542\\    
W Gem       & 7.913960  & FM   &I&257       &WZ Sgr   &21.849708 &AFGR &GSSRGA&50\\  
$\zeta$ Gem & 10.150780 & FM   &BBMD&179    &SZ Tau   &3.148727  &FM   &GSSRGA &--\\   
BG Lac      & 5.331938  & FM   &I&114       &SV Vul   &44.999660 &AFGR &I&103\\
Y  Lac      & 4.323776  & FM   &I&46       &T Vul    &4.435532  &FM   &BBMD&530\\ 
Z  Lac      & 10.88554  & FM   &BMS,GSSRGA&273&U Vul  &7.990736  &AFGR &GSSRGA&142\\   
X Lac       & 5.444990  & FM   &BBMD &1.9   &X Vul    &6.319562  &FM   &GSSRGA&--\\  
T Mon       & 27.024649 & FM   &GSSRGA&--  &         &          &     & &\\
BF Oph      & 4.067695  & AFGR &BMS, G &1077  &         &          &     & &\\
\hline
\end{tabular}}
\smallskip
Photometry sources: Arellano Ferro et~al. (AFGR, \cite{Arellano1998}); Feltz \& McNamara (FM, \cite{Feltz1980}) and Eggen (Eg, \cite{Eggen1985}, \cite{Eggen1996}).\\
Radial velocity sources: Evans (E, \cite{Evans1980}); Gieren (G, \cite{Gieren1981}); Barnes et~al. (BMS, \cite{Barnes1987}, \cite{Barnes1988}); Coulson et~al. (CCG, \cite{Coulson1985}); Wilson et~al. (WCB, \cite{Wilson1989}); 
Metzger et~al. (MCMS, \cite{Metzger1993}); Bersier et~al. (BBMD, \cite{Bersier1994}); Gorynya et~al. (GSSRGA, \cite{Gorynya1998}); Kiss (K, \cite{Kiss1998}) and Imbert (I, \cite{Imbert1999}).
$\Delta (Ph-RV)$: number of pulsational cycles between photometric and radial velocity curves.
\end{table}