\begin{table}%t7
\caption{\label{4:tab:outflow}Temperature constraints of CO line wings ratios$^d$. }
%\centerline
 {\small \begin{tabular}{l l l l l l l l l}
\hline \hline
Source &   \multicolumn{2}{c}{CO 3--2/4--3} &  \multicolumn{2}{c}{CO 4--3/7--6} & \multicolumn{2}{c}{$T_{\rm{outflow}}$ (K)}& \multicolumn{2}{c}{$T_{\rm{outflow}}$ (K)}\\
 & & & & & \multicolumn{2}{c}{Scenario 1$^a$} &  \multicolumn{2}{c}{Scenario 2$^b$} \\
 & \multicolumn{2}{c}{\hrulefill}  &  \multicolumn{2}{c}{\hrulefill}  &  \multicolumn{2}{c}{\hrulefill}  &  \multicolumn{2}{c}{\hrulefill}\\
 & Red$^c$ & Blue$^c$ & Red & Blue & Red & Blue & Red & Blue  \\
\hline
Ced 110 IRS 4 & 1.0 & 1.2 & 3.5 & --  & 50 & 40 & 170 & 160 \\ 
Ced 110 IRS 6& 2.2 & 1.7 &-- & -- & $<$30 & 40 & 50 & 60\\ 
HH46 & 1.0 &1.6--2.0 &2.0 & -- & 50 & $<$ 40 & 180 & 80 \\ 
IRAS 12496 & -- & 0.8 & -- & $>$4 & -- & 50 & -- & $<$200 \\ 
IRAS 15398 & -- & 0.7 & -- & 0.8 & -- & 100 & -- & $>$200\\
\hline
\end{tabular}}
\medskip
$^a$ Lines thermally excited ($n>n_{\rm{cr}}$); $^b$~lines subthermally excited ($n$ assumed to be 10$^4$~cm$^{-3}$); $^c$ red and Blue outflow contributions are calculated by excluding the central 3~km~s$^{-1}$ emission; $^d$~errors on the temperatures are 25\%, except for temperatures above 150~K, where it is estimated to be at 40\%.
\end{table}