\begin{table}
\caption{\label{table radio data}Reduction of the Cyg~OB2 No.~8A VLA data. }
\begin{tabular}{lllrrcrrrlcl}
\hline\hline
& \multicolumn{1}{c}{(1)} & \multicolumn{1}{c}{(2)} & \multicolumn{1}{c}{(3)} &
\multicolumn{1}{c}{(4)} & \multicolumn{1}{c}{(5)} & \multicolumn{1}{c}{(6)} &
\multicolumn{1}{c}{(7)} & \multicolumn{1}{c}{(8)} & \multicolumn{1}{c}{(9)} &
\multicolumn{1}{c}{(10)} & \multicolumn{1}{l}{(11)} \\
& \multicolumn{1}{c}{Progr.} & \multicolumn{1}{c}{Date} &
\multicolumn{1}{c}{Ctr.} &
\multicolumn{3}{c}{Phase calibrator} &
\multicolumn{1}{c}{Int.} &
\multicolumn{1}{c}{No.} &
\multicolumn{1}{c}{Config.} &
\multicolumn{1}{c}{Flux} &
\multicolumn{1}{l}{Notes}\\
\cline{5-7}
&  &  & &
\multicolumn{1}{c}{Name} &
\multicolumn{1}{c}{Flux} &
\multicolumn{1}{c}{Dist.} &
\multicolumn{1}{c}{time} &
\multicolumn{1}{c}{Ants.} & &
\multicolumn{1}{c}{} & \\
&  &  & &
\multicolumn{1}{c}{} &
\multicolumn{1}{c}{(Jy)} &
\multicolumn{1}{c}{(degr.)} &
\multicolumn{1}{c}{(min)} &
\multicolumn{1}{c}{} & &
\multicolumn{1}{c}{(mJy)} & \\
\hline
\multicolumn{3}{l}{2   cm} \\*
& AA28   & 1984-03-04 & 8 & 2007+404 &  $3.33 \pm 0.28$  & 4.9  &  20 & 27 & CnB &   $0.7 \pm 0.4$   & \tablefootmark{a} \\
& AC116  & 1984-12-21 & 8 & 2007+404 &  $3.96 \pm 0.07$  & 4.9  &  10 & 27 &  A  &   $0.62\pm 0.19$  & \tablefootmark{a} \\
& AS786  & 2004-02-15 & 7 & 2015+371 &  $2.88 \pm 0.03$  & 5.4  &  60 & 26 & CnB &         $<$4.	& \\
\multicolumn{3}{l}{3.6 cm} \\*
& AS397  & 1990-02-16 & 8 & 2007+404 &  $3.10 \pm 0.04$  & 4.9  &  59 & 22 &  A  &   $0.48\pm 0.05$  &  \\
& AH395  & 1990-02-17 & 8 & 2007+404 &  $3.05 \pm 0.01$  & 4.9  &  44 & 22 &  A  &   $0.66\pm 0.04$  &  \\
& AW288  & 1991-07-04 & 8 & 2025+337 &  $2.08 \pm 0.06$  & 7.7  &   5 & 26 &  A  &   $0.70\pm 0.09$  &  \tablefootmark{b} \\
& AW304  & 1992-01-24 & 8 & 2007+404 &  $2.87 \pm 0.03$  & 4.9  &  12 & 24 & CnB &   $1.06\pm 0.07$  &  S\tablefootmark{b}  \\
& BP1    & 1992-05-30 & 9 & 2052+365 &  $1.87 \pm 0.01$  & 6.0  &  99 & 23 & DnC &         $<$1.1	&  \\
& AB671  & 1993-01-24 & 9 & 2007+404 &  $3.33 \pm 0.07$  & 4.9  &  23 & 27 &  A  &         $<$5.	&  S  \\
& AB671  & 1993-01-29 & 9 & 2007+404 &  $3.33 \pm 0.02$  & 4.9  &  24 & 27 & BnA &         $<$2.0	&  S  \\
& AB671  & 1993-02-01 & 9 & 2007+404 &  $3.29 \pm 0.03$  & 4.9  &   6 & 27 & BnA &         $<$4.	&  \\
& AB671  & 1993-02-14 & 9 & 2007+404 &  $3.41 \pm 0.03$  & 4.9  &   7 & 27 & BnA &         $<$4.	&  S  \\
& AB671  & 1993-02-20 & 9 & 2007+404 &  $3.8  \pm 0.1 $  & 4.9  &  14 & 24 &  B  &         $<$5.	&  \\
& AS483  & 1993-05-01 & 98& 2007+404 &  $3.28 \pm 0.01$  & 4.9  &  25 & 27 &  B  &   $1.19\pm 0.13$  &  S\tablefootmark{b} \\
& AR277  & 1994-04-17 & 9 & 2007+404 &  $2.97 \pm 0.01$  & 4.9  &  23 & 14 &  A  &         $<$5.	 &  S  \\
& AR328  & 1995-04-27 & 9 & 2007+404 &  $2.77 \pm 0.01$  & 4.9  &  11 & 16 &  D  &         $<$2.7   &  \\
& AS644  & 1999-02-05 & 7 & 2007+404 &  $2.07 \pm 0.12$  & 4.9  &  35 & 23 & DnC &   $1.0 \pm 0.3 $  &  \\
& AS644  & 1999-04-18 & 8 & 2015+371 &  $2.17 \pm 0.01$  & 4.9  &   5 & 27 &  D  &   $0.92\pm 0.10$  &  \\
& AW515  & 1999-06-08 & 9 & 2007+404 &  $2.02 \pm 0.01$  & 4.9  &  10 & 19 & AD  &         $<$2.8   &  I,S  \\
& BB116  & 1999-12-04 & 9 & 2007+404 &  $2.20 \pm 0.01$  & 4.9  & 101 & 27 &  B  &   $1.96\pm 0.26$  &  \\
& BB116  & 2000-06-26 & 9 & 2007+404 &  $2.40 \pm 0.01$  & 4.9  &  20 & 26 & DnC &   $2.9 \pm 2.3 $  &  \\
& AS786  & 2004-02-15 & 7 & 2015+371 &  $2.76 \pm 0.02$  & 5.4  &  45 & 25 & CnB &   $1.12\pm 0.18$  &  \tablefootmark{c} \\
& BD110  & 2005-11-15 & 9 & 2007+404 &  $2.29 \pm 0.02$  & 4.9  &  21 & 22 &  D  &         $<$2.1   &  S  \\
& AB1195 & 2006-01-26 & 8 & 2007+404 &  $2.37 \pm 0.05$  & 4.9  &  31 & 16 & AD  &   $0.58\pm 0.27$  &  \\
& AB1210 & 2006-05-24 & 8 & 2007+404 &  $2.21 \pm 0.02$  & 4.9  &  27 & 21 & BnA &   $0.98\pm 0.05$  &  \\
\multicolumn{5}{l}{{6 cm}}\\*
& CHUR   & 1980-05-23 & 8 & 2007+404 &  $4.73 \pm 0.03$  &  4.9 &  47 & 22 & AD  &   $1.33\pm 0.13$  &   $1\times 50 $\tablefootmark{a}   \\
& CHUR   & 1980-05-24 & 8 & 2007+404 &  $4.58 \pm 0.03$  &  4.9 &  47 & 22 & AD  &   $1.18\pm 0.11$  &   $1\times 50 $\tablefootmark{a} \\
& BIGN   & 1981-10-16 & 9 & 2007+404 &  $4.16 \pm 0.04 $ &  4.9 &  17 & 27 & C   &   $0.8 \pm 0.4 $  &   S, $1\times 50$   \\
& BECK   & 1982-03-27 & 9 & 2007+404 &  $4.74 \pm 0.01 $ &  4.9 & 228 & 27 & A   &   $1.5 \pm 0.4 $  &   S, $1\times 50 $  \\
& BECK   & 1982-07-03 & 9 & 2007+404 &  $4.95 \pm 0.02 $ &  4.9 &   5 & 26 & A   &         $<$5.	&   S, $1\times 50 $  \\
& BIEG   & 1982-08-26 & 9 & 2007+404 &  $4.4  \pm 0.1  $ &  4.9 &   9 & 24 & B   &         $<$3.	&   $1\times 50$ \\
& BECK   & 1982-12-21 & 9 & 2023+318 &  $2.86 \pm 0.01 $ &  9.6 &   9 & 24 & D   &         $<$2.4	&   S, $1\times 50$   \\
& AC42   & 1983-05-09 & 9 & 2007+404 &  $4.46 \pm 0.02 $ &  4.9 &  10 & 26 & C   &         $<$1.2	&   $1\times 50$   \\
& AC42   & 1983-08-22 & 9 & 2007+404 &  $4.85 \pm 0.01 $ &  4.9 &  14 & 25 & A   &         $<$4.	&   \\
& AB228  & 1983-08-27 & 9 & 2007+404 &  $4.90 \pm 0.03 $ &  4.9 &  18 & 27 & A   &         $<$3.	&   \\
& AB252  & 1983-10-30 & 9 & 2007+404 &  $4.84 \pm 0.02 $ &  4.9 &   9 & 26 & A   &         $<$4.	&   S \\
& AA28   & 1984-03-04 & 8 & 2007+404 &  $4.27 \pm 0.01 $ &  4.9 &  41 & 27 & CnB &   $0.91\pm 0.10$  &   \tablefootmark{a} \\
& AA28   & 1984-03-09 & 8 & 2007+404 &  $4.33 \pm 0.01 $ &  4.9 &  23 & 26 & CnB &   $0.78\pm 0.13$  &   \\
& AA29   & 1984-04-04 & 9 & 2007+404 &  $4.21 \pm 0.02 $ &  4.9 &  11 & 27 & C   &         $<$0.9   &   S\tablefootmark{a} \\
& VM59   & 1984-10-16 & 9 & 2202+422 &  $2.72 \pm 0.01 $ & 16.7 &  13 & 26 & D   &         $<$2.4   &   S \\
& AC116  & 1984-11-27 & 9 & 2007+404 &  $4.50 \pm 0.01 $ &  4.9 &  19 & 25 & A   &         $<$2.8   &   S \\
& AC116  & 1984-12-21 & 8 & 2007+404 &  $4.63 \pm 0.01 $ &  4.9 &   6 & 27 & A   & 0.56  $\pm$ 0.13  &   \tablefootmark{a} \\
& AF102  & 1985-05-09 & + & 2022+616 &  $2.43 \pm 0.01 $ & 20.4 &   9 & 26 & B   &         $<$1.3   &   S \\
& AA47   & 1985-06-12 & 7 & 2007+404 &  $3.87 \pm 0.01 $ &  4.9 &  24 & 22 & B   & 0.98  $\pm$ 0.27  &   \\
& AA47   & 1985-09-01 & 9 & 2007+404 &  $3.53 \pm 0.01 $ &  4.9 &   7 & 27 & C   &         $<$1.0   &   \\
& AA47   & 1985-09-19 & 9 & 2007+404 &  $3.56 \pm 0.01 $ &  4.9 &  11 & 25 & C   &         $<$0.8   &   \\
& VM115  & 1990-06-11 & 9 & 2202+422 &  $3.24 \pm 0.01 $ & 16.7 &  19 & 22 & A   &         $<$1.6   &   \\
& AG320  & 1991-03-06 & SE& 2007+404 &  $2.73 \pm 0.01 $ &  5.3 &  10 & 25 & D   & 1.4   $\pm$ 0.6   &   \\
& AB671  & 1993-01-21 & 9 & 2007+404 &  $3.09 \pm 0.01 $ &  4.9 &  19 & 24 & A   &         $<$2.3   &   S \\
& AB671  & 1993-01-24 & 9 & 2007+404 &  $3.08 \pm 0.03 $ &  4.9 &  18 & 27 & A   &         $<$2.8   &   S \\
& AB671  & 1993-01-29 & 9 & 2007+404 &  $3.12 \pm 0.02 $ &  4.9 &  19 & 27 & BnA & 2.1   $\pm$ 1.1   &   S \\
& AB671  & 1993-02-01 & 9 & 2007+404 &  $3.11 \pm 0.01 $ &  4.9 &   7 & 27 & BnA & 1.2   $\pm$ 0.7   &   S \\
& AB671  & 1993-02-14 & 9 & 2007+404 &  $3.12 \pm 0.02 $ &  4.9 &   8 & 27 & BnA & 2.2   $\pm$ 1.4   &      \\
& AS483  & 1993-05-01 & 98& 2007+404 &  $3.04 \pm 0.01 $ &  4.9 &  21 & 25 & B   & 1.33  $\pm$ 0.16  &   \tablefootmark{b} \\
& TST6CM & 1993-06-04 & 9 & 2052+365 &  $5.2  \pm 0.2  $ &  6.0 &  29 & 26 & CnB &         $<$0.8   &   X \\
& AR277  & 1994-04-17 & 9 & 2007+404 &  $3.04 \pm 0.01 $ &  4.9 &  23 & 15 & A   &         $<$4.	 &   \\
& AR328  & 1995-04-27 & 9 & 2007+404 &  $2.982\pm 0.003$ &  4.9 &  11 & 16 & D   &         $<$2.3   &   \\
& AS644  & 1999-02-05 & 7 & 2007+404 &  $2.6  \pm 0.1  $ &  4.9 &  20 & 23 & DnC & 1.1   $\pm$ 0.5   &   \\
& AS644  & 1999-04-18 & 8 & 2015+371 &  $1.728\pm 0.003$ &  5.4 &   5 & 26 & D   & 0.93  $\pm$ 0.19  &   \\
& AW515  & 1999-06-08 & 9 & 2007+404 &  $2.40 \pm 0.03 $ &  4.9 &  10 & 21 & AD  &         $<$1.4   &   I, S \\
& AS786  & 2004-02-15 & 7 & 2015+371 &  $2.778\pm 0.003$ &  5.4 &  61 & 26 & CnB & 1.21  $\pm$ 0.28  &   \tablefootmark{c} \\
& AB1156 & 2005-02-04 & 8 & 2007+404 &  $2.47 \pm 0.01 $ &  4.9 &  31 & 25 & BnA & 1.28  $\pm$ 0.05  &   \\
& AB1156 & 2005-02-06 & 8 & 2007+404 &  $2.50 \pm 0.02 $ &  4.9 &  31 & 25 & BnA & 1.27  $\pm$ 0.06  &   \\
& AB1156 & 2005-02-08 & 8 & 2007+404 &  $2.52 \pm 0.01 $ &  4.9 &  31 & 25 & BnA & 1.11  $\pm$ 0.12  &   \\
& AB1156 & 2005-02-11 & 8 & 2007+404 &  $2.52 \pm 0.01 $ &  4.9 &  31 & 25 & BnA & 0.88  $\pm$ 0.07  &   \\
& AB1156 & 2005-02-13 & 8 & 2007+404 &  $2.49 \pm 0.02 $ &  4.9 &  31 & 24 & BnA & 0.76  $\pm$ 0.05  &   \\
& AB1156 & 2005-02-18 & 8 & 2007+404 &  $2.44 \pm 0.01 $ &  4.9 &  51 & 24 & B   & 0.64  $\pm$ 0.04  &   \\
& AB1156 & 2005-02-25 & 8 & 2007+404 &  $2.49 \pm 0.01 $ &  4.9 &  30 & 24 & B   & 1.11  $\pm$ 0.06  &   \\
& AB1156 & 2005-02-27 & 8 & 2007+404 &  $2.49 \pm 0.01 $ &  4.9 &  51 & 25 & B   & 0.98  $\pm$ 0.06  &   \\
& AB1156 & 2005-02-28 & 8 & 2007+404 &  $2.47 \pm 0.01 $ &  4.9 &  30 & 25 & B   & 1.29  $\pm$ 0.05  &   \\
& AB1156 & 2005-03-01 & 8 & 2007+404 &  $2.410\pm 0.004$ &  4.9 &  31 & 24 & B   & 1.14  $\pm$ 0.07  &   \\
& AB1156 & 2005-03-02 & 8 & 2007+404 &  $2.44 \pm 0.01 $ &  4.9 &  29 & 25 & B   & 1.26  $\pm$ 0.05  &   \\
& AB1156 & 2005-03-08 & 8 & 2007+404 &  $2.44 \pm 0.01 $ &  4.9 &  26 & 25 & B   & 0.72  $\pm$ 0.05  &   \\
& AB1156 & 2005-03-12 & 8 & 2007+404 &  $2.43 \pm 0.01 $ &  4.9 &  30 & 25 & B   & 0.73  $\pm$ 0.05  &   \\
& BD110  & 2005-11-15 & 9 & 2007+404 &  $2.51 \pm 0.01 $ &  4.9 &  18 & 21 & D   &         $<$1.9   &   S \\
\multicolumn{5}{l}{{20 cm}}\\*
& BIEG   & 1982-08-26 & 12& 2007+404 &  $4.00 \pm 0.04 $ &  4.8 & 53  & 24 & B   &         $<$3.1   &  \\
& AB228  & 1983-08-25 & 9 & 2007+404 &  $4.19 \pm 0.02 $ &  4.9 & 28  & 24 & A   &         $<$2.2   &  \\
& AB228  & 1983-08-27 & 12& 2007+404 &  $4.31 \pm 0.02 $ &  4.8 & 107 & 26 & A   &         $<$2.5   &  \\
& AA28   & 1984-03-09 & 8 & 2007+404 &  $4.15 \pm 0.02 $ &  4.9 & 26  & 26 & CnB &  $1.14 \pm 0.28$  &  \\
& AC116  & 1984-11-27 & 9 & 2007+404 &  $4.06 \pm 0.02 $ &  4.9 & 33  & 25 & A   &  $ 2.6 \pm 0.8 $  &  \\
& AC116  & 1984-12-21 & 8 & 2007+404 &  $3.98 \pm 0.03 $ &  4.9 & 11  & 27 & A   &  $1.29 \pm 0.13$  &  \tablefootmark{a} \\
& AT61   & 1985-04-04 & 9 & 2052+365 &  $5.43 \pm 0.01 $ &  6.0 & 14  & 25 & BnA &         $<$1.7   &  \\
& AA47   & 1985-09-19 & 9 & 2007+404 &  $3.92 \pm 0.04 $ &  4.9 & 13  & 26 & C   &         $<$4.	 &  S \\
& AR170  & 1987-10-16 & 5 & 2052+365 &  $5.20 \pm 0.02 $ &  6.2 & 26  & 23 & BnA & 2.1   $\pm$ 1.2   &  \\
& AR170  & 1987-11-09 & 5 & 2052+365 &  $5.07 \pm 0.05 $ &  6.2 & 9   & 21 & BnA &         $<$4.	&  \\
& AM305  & 1990-07-05 & 80& 2007+404 &  $2.84 \pm 0.02 $ &  4.9 & 5   & 26 & BnA &         $<$2.8	&  $2\times 25$ \\
& AFTST  & 1991-08-11 & 21& 2052+365 &  $5.15 \pm 0.01 $ &  6.0 & 38  & 19 & A   &         $<$5.	&  \\
& AW311  & 1992-03-15 & 21& 2022+542 &  $1.036\pm 0.002$ & 13.2 & 29  & 27 & C   &         $<$5.	&  S \\
& TST6CM & 1993-06-04 & 9 & 2052+365 &  $6.4  \pm 0.3  $ &  6.0 & 13  & 27 & CnB &         $<$4.	&  S \\
& AL372  & 1996-03-28 & 5 & 2038+513 & 5.80              & 10.1 & 10  & 25 & C   &         $<$3.0	&  S,~PH  \\
&        &            &   &          &                   &      &     &    &     &                   &  $2\times 3.125$  \\
& AA237  & 1999-02-01 & J2& 2052+365 & 5.31  $\pm$ 0.03  &  6.1 & 11  & 27 & C   &         $<$4.    &  \\
\hline
\end{tabular}
\tablefoot{
Column (1) gives the programme name; (2) the date of the observation;
(3) the source on which the observation was centred;
(4) the phase calibrator name (J2000 coordinates);
(5) the phase calibrator flux; and 
(6) distance to the observation centre;
(7) the integration time on the source;
(8) the number of antennas that gave a usable signal;
(9) the configuration the VLA was in at the time of the observation;
(10) the measured flux; and
(11) refers to the notes.
Many of the VLA observations were made in two sidebands, each of which has a 
bandwidth of 50 MHz; the exceptions are noted in Col.~(11).
Upper limits are 3 $\times$ the rms. \\
The details of Col.~(3) are: the source on which the observation was centred
is mostly indicated by \citet{1956ApJ...124..530S} Cyg~OB2 numbers. 
Other indicators are:
``98'' is in between Cyg~OB2 No.~8A and No.~9; ``+'' is listed in the observing log as
2031+411;
``80'' as F80XF, ``21'' as 2032+41;
``J2'' as 2033+4118\_2 and ``SE'' as TEVSE. \\
The notes in Col.~(11) are: 
 ``$1\times 50$'' (or a similar code): bandwidth different from standard $2\times 50$~MHz;
 ``I'':  stripes are visible on this image, complicating the flux measurement;
 ``PH'':  flux calibration on phase calibrator; 
 ``S'':  selfcalibration applied; 
 ``X'':    flux calibration is very uncertain; check on flux of phase calibrator suggests a factor of 2 uncertainty.
Column (11) also gives references for those
observations that have already been published in the literature:
\tablefoottext{a}{\citet{1989ApJ...340..518B};} 
\tablefoottext{b}{\citet{1998ApJS..118..217W};} 
\tablefoottext{c}{\citet{2006AetA...454..625P}}.
}
\end{table}