\begin{table}%t4
\caption{\label{coh}Observational parameters of the C$^{18}$O and HCO$^+$ lines.} 
\small%\centerline
{
\begin{tabular}{lccc}
\hline\hline\noalign{\smallskip}
  Source & $W$ [K~km~s$^{-1}$]  & $\Delta v$ [km~s$^{-1}$] & $W$ [K~km~s$^{-1}$]  \\
  & (C$^{18}$O) & (C$^{18}$O) & (HCO$^+$) \\
\hline 
L 1448 IRS 2      &$3.23 \pm 0.05 $ &$0.77 \pm 0.01 $  &$13.0 \pm 0.3\rm^{*}$\\
L 1448 IRS 3      &$5.75 \pm 0.07 $ &$1.22 \pm 0.01 $  &$29.0 \pm 0.3$\\
L 1448 C          &$3.36 \pm 0.06 $ &$1.11 \pm 0.01 $  &$20.6 \pm 0.3\rm^{*}$  \\
L 1455 A1         &$1.65 \pm 0.06 $ &$1.03 \pm 0.01 $  &$ 8.8 \pm 0.3$   \\
L 1455 A2         &$0.90 \pm 0.05 $ &$0.80 \pm 0.01 $  &$ 6.5 \pm 0.3$   \\
Per 4 S           &$2.84 \pm 0.06 $ &$0.81 \pm 0.01 $  &$ 8.7 \pm 0.3$     \\
Per 4 N           &$1.30 \pm 0.04 $ &$0.44 \pm 0.01 $  &$ 5.3 \pm 0.3$    \\
Per 5             &$1.79 \pm 0.05 $ &$0.69 \pm 0.01 $  &$15.0 \pm 0.3$     \\
Per 6             &$1.52 \pm 0.05 $ &$0.74 \pm 0.01 $  &$ 6.1 \pm 0.3\rm^{*}$   \\
IRAS 03282        &$1.95 \pm 0.07 $ &$1.47 \pm 0.01 $  &$12.8 \pm 0.3\rm^{*}$ \\
Barnard 1-B       &$8.09 \pm 0.08 $ &$1.59 \pm 0.01 $  &$14.0 \pm 0.3\rm^{*}$ \\
HH 211            &$5.19 \pm 0.06 $ &$0.81 \pm 0.01 $  &$17.4 \pm 0.3\rm^{*}$    \\
Barnard 5 IRS 1   &$3.99 \pm 0.06 $ &$1.00 \pm 0.01 $  &$ 9.3 \pm 0.3\rm^{*}$ \\
L 1527            &$4.12 \pm 0.06 $ &$0.65 \pm 0.01 $  &$13.0 \pm 0.3\rm^{*}$    \\
L 483             &$5.12 \pm 0.06 $ &$0.81 \pm 0.01 $  &$22.8 \pm 0.3\rm^{*}$  \\
SMM 5             &$8.66 \pm 0.08 $ &$1.57 \pm 0.01 $  &$10.7 \pm 0.3$          \\
L 723             &$2.45 \pm 0.08 $ &$1.29 \pm 0.01 $  &$12.2 \pm 0.3\rm^{*}$         \\
L 673 A           &$2.31 \pm 0.07 $ &$0.92 \pm 0.01 $  &$12.8 \pm 0.3$        \\
B 335             &$2.34 \pm 0.04 $ &$0.44 \pm 0.01 $  &$ 3.6 \pm 0.3\rm^{*}$           \\
L 1157            &$1.57 \pm 0.05 $ &$0.61 \pm 0.01 $  &$13.4 \pm 0.3\rm^{*}$         \\
\hline
\end{tabular}}
\smallskip
Integrated HCO$^+$ intensities from double-peaked spectra are indicated with an $^{*}$.
\end{table}