\begin{table}%t1
\caption{\label{observations}Observed  residual velocities of OB-associations in the stellar-gas complexes.}
%\centering
\par
\begin{tabular}{lcccccl}
\hline \hline \noalign{\smallskip}
  Region& {\it R} & $V_{R~{\rm obs}}$ & $V_{\theta~{\rm obs}}$  & {\it l}  & {\it r} & Associations \\
    &  kpc& km s$^{-1}$ & km s$^{-1}$  & deg. & kpc &  \\
  \\ 
  \hline 
  Sagittarius & 5.6 & $+9.9\pm2.4$ & $-1.0\pm1.9$ & 8--23  & 1.3--1.9 & Sgr OB1, OB7, OB4, Ser OB1, OB2, \\
  & & & & & &  Sct OB2, OB3;\\
  Carina & 6.5 & $-5.8\pm3.3$ & $+4.7\pm2.2$ & 286--315  & 1.5--2.1 & Car OB1, OB2, Cru OB1, Cen OB1,\\
  & & & & & &   Coll 228, Tr 16, Hogg 16, NGC 3766, 5606;\\
  Cygnus & 6.9 & $-5.0\pm2.6$ & $-10.4\pm1.4$ & 73--78  & 1.0--1.8 & Cyg OB1, OB3, OB8, OB9; \\
  Local System & 7.4 & $+5.3\pm2.8$ & $+0.6\pm2.5$ & 0--360  & 0.1--0.6 & Per OB2, Mon OB1, Ori OB1, Vela OB2, \\
  & & & & & &   Coll 121, 140, Sco OB2; \\
  Perseus & 8.4 & $-6.7\pm3.0$ & $-5.9\pm1.5$ & 104--135  & 1.8--2.8 & Per OB1, NGC 457, Cas OB8, OB7, OB6, \\
  & & & & & &  OB5, OB4, OB2, OB1, Cep OB1;\\
  \hline
\end{tabular}
\end{table}