\begin{table}%t2
%\centering
\par
\caption{Receivers used for the observations.\label{tab2}}
{\small
\begin{tabular}{lll}           
\hline \hline
{Code as}&&\\
given in&Description&reference\\
the tables&&\\        
\hline     
VISU&Visual &BARCELONA,\\[-1mm]
& &CATANIA2 (06-07-1997),CATANIA3 (03-08-1997) \\[-0.5mm]
& &LUMEZZANE (18-09-1997),MILANO,SEVILLA,MADRID\\     
\hline     
&Single channel receivers&\\
\hline
PM&EMI9893 &CATANIA1 (Blanco) \\[-0.5mm]
PM1&Photoelectric lp21 &LUMEZZANE \\[-0.5mm]
PM2&Photometer (RCA 4840) &PARIS \\[-0.5mm]
PM3&Hamamatsu R647-04 &FUNAHO,OKAYAMA \\[-0.5mm]
PM4&RCA931A &SAN-FERNANDO \\[-0.5mm]
PM5&UBV (Shugarov) &NAUCHNY (07-10) \\[-0.5mm]
PM6&Optec SSP3 Pin-Diode &ESSEN \\[-0.5mm]
PMW&Photometer WBVR &NAUCHNY  \\[-0.5mm]
PMIR&Photometer IR &TENERIFE    \\[-0.5mm]
PM7&Teloc II B channel photometric system&(CALERN) \\[-0.5mm]
PM7&Teloc II V channel photometric system&(CALERN)  \\[-0.5mm]
PM7&Teloc II R channel photometric system&(CALERN)  \\
\hline 
&Video receivers&\\
\hline
V&Video OS25 (18-06) &PRAHA \\[-0.5mm]
V1&Video OS45D &PRAHA \\[-0.5mm]
V2&Ikegama B/W camera ICD-42E TypeF &WILP-ACHTERHOEK \\[-0.5mm]
V3&CCD MKII in video mode&MEUDON \\
\hline 
&CCD receivers&\\
\hline
CCD&Starlight SX Xpress &CACERES,ZARAGOZA \\[-0.5mm]
CCD1&TH7863 &BORDEAUX,OHP \\[-0.5mm]
CCD2&TC-211 &BOWIE,ELLINBANK,NEW-YORK,SASSOEIROS,TORINO \\[-0.5mm] 
CCD3&IRAC2 &ESO \\[-0.5mm]
CCD4&SPT-M102CE Sony B/W &LISBOA \\[-0.5mm]
CCD5&NXA 1001/03 &REUX \\[-0.5mm]
CCD6&VC100-camera B/W &COMTHUREY \\[-0.5mm]
CCD7&CCD B/W camera &OOSTDUINKERKE \\[-0.5mm]
CCD8&KAF-6300 KODAK &UKKEL \\[-0.5mm]
CCD10&Hi-SIS11 &CHATEAUGIRON \\[-0.5mm]
CCD11&LYNX CCD camera 192x168 pixel-chip &STUTTGART \\[-0.5mm]
CCD12&0.01 lux CCD video camera &TOPEKA \\[-0.5mm]
CCDI&Hisis-22 &BUCHAREST1 (Vass),PIC-DU-MIDI \\[-0.5mm]
CCDL&LYNX PC &ASHEVILLE  \\[-0.5mm]
CCDM&TC245 (IOC) &MUNICH \\[-0.5mm]
CCDS&Chip CCD Sony &RAGUSA \\[-0.5mm]
CCDW&Wright 1024x1024 &TENERIFE \\[-0.5mm]
CCDST&ST-6V SBIG &ALMA-ATA,BUCHAREST2 (Stefanescu)  \\[-0.5mm]
CCDVX&HCS MXRII &BOSKOOP  \\[-0.5mm]
CCDC&Thomson-CSF 7862 CDA chip \\[-0.5mm]
&(photometrics CCD system) &KAVALUR \\
\par
\hline
\par
\end{tabular}  
  }  
\end{table}