\begin{table}%t1
%\centering
\par
\caption{\label{tbl_fields}Main characteristics of the seven fields towards the GB observed with   {\em Spitzer} as part of programme 2345.}
\vspace*{-1.5mm}
\begin{tabular}{lcccrcc}
\hline\hline \noalign{\smallskip}
Field name & RA range (h m s) & Dec range ($\degr\ \arcm\ \arcs$) & $l$ centre & $b$ centre & Date IRAC obs & Date MIPS obs \\
\hline
Bulge 1    & 17 51 14.2 \dots 17 52 36.7 &  $-$29 15 22 \dots $-$29 34 15 & 0.30 & $-$1.42 & 2005 03 30 & 2005 04 09 \\
Bulge 2    & 17 55 02.1 \dots 17 56 24.2 &  $-$29 26 25 \dots $-$29 45 13 & 0.56 & $-$2.23 & 2005 03 31 & 2005 04 10 \\
Bulge 3    & 17 58 50.7 \dots 18 00 13.3 &  $-$29 41 08 \dots $-$29 59 59 & 0.76 & $-$3.07 & 2005 03 30 & 2005 04 10 \\
Bulge 4    & 17 50 16.1 \dots 17 51 36.4 &  $-$26 08 56 \dots $-$26 27 51 & 2.87 &    0.35 & 2005 03 30 & 2005 04 09 \\
Bulge N~1 & 17 48 51.9 \dots 17 50 14.8 &  $-$29 17 42 \dots $-$29 36 42 & 0.00 & $-$1.00 & 2005 03 30 & 2005 04 08 \\
Bulge N~2 & 17 47 55.8 \dots 17 49 16.3 &  $-$28 28 41 \dots $-$28 46 19 & 0.63 & $-$0.36 & $-$        & 2005 04 13 \\
NGC~6522  & 18 02 30.4 \dots 18 03 53.5 &  $-$29 49 26 \dots $-$30 08 24 & 1.03 & $-$3.83 & 2005 03 30 & 2005 04 10 \\
\hline
\end{tabular}
\vspace*{-2mm}
\end{table}