\begin{table}%t5
\caption{\label{t:xochomodel}Parameters of our best-fit LTE~models of formic acid, methyl formate, ethanol, and dimethyl ether.}
\small%\centerline
 {
\begin{tabular}{lccccc}
 \hline\hline
%&&&&& \\[-8pt]
 \multicolumn{1}{c}{Molecule$^{a}$} & \multicolumn{1}{c}{Size$^{b}$} & \multicolumn{1}{c}{$T_{{\rm rot}}${}$^{c}$} & \multicolumn{1}{c}{$N^{d}$} & \multicolumn{1}{c}{$\Delta V^{e}$} & \multicolumn{1}{c}{$V_{{\rm off}}${}$^{f}$} \\ 
  & \multicolumn{1}{c}{\scriptsize ($''$)} & \multicolumn{1}{c}{\scriptsize (K)} & \multicolumn{1}{c}{\scriptsize (cm$^{-2}$)} & \multicolumn{1}{c}{\scriptsize (km~s$^{-1}$)} & \multicolumn{1}{c}{\scriptsize (km~s$^{-1}$)} \\ 
 \multicolumn{1}{c}{(1)} & \multicolumn{1}{c}{(2)} & \multicolumn{1}{c}{(3)} & \multicolumn{1}{c}{(4)} & \multicolumn{1}{c}{(5)} & \multicolumn{1}{c}{(6)} \\ 
 \hline
%&&&&& \\[-8pt]
$t$-HCOOH & 5.0 &   70 & $ 1.50 \times 10^{16}$ & 8.0 & --1.0 \\  & 5.0 &   70 & $ 7.50 \times 10^{15}$ & 8.0 & 9.0 \\ 
CH$_3$OCHO & 4.0 &   80 & $ 4.50 \times 10^{17}$ & 7.2 & 0.0 \\  & 4.0 &   80 & $ 1.50 \times 10^{17}$ & 7.2 & 10.0 \\ 
C$_2$H$_5$OH & 3.0 &  100 & $ 8.40 \times 10^{17}$ & 8.0 & 0.0 \\  & 3.0 &  100 & $ 3.00 \times 10^{17}$ & 7.0 & 10.0 \\ 
CH$_3$OCH$_3$ & 2.5 &  130 & $ 2.30 \times 10^{18}$ & 6.0 & 0.0 \\  & 2.5 &  130 & $ 1.10 \times 10^{18}$ & 6.0 & 10.0 \\  
\hline
 \end{tabular}}
\medskip 
Notes: $^a$~We used the CDMS entry for \textit{t}-HCOOH (version~1), and the JPL entries for CH$_3$OCHO (ver.~1), C$_2$H$_5$OH (ver.~4), and CH$_3$OCH$_3$ (ver.~1). See references to the laboratory data therein.
 $^b$~Source diameter (\textit{FWHM}).
 $^c$~Temperature.
 $^d$~Column density.
 $^e$~Linewidth (\textit{FWHM}).
 $^f$~Velocity offset with respect to the systemic velocity of Sgr~B2(N) $V_{{\rm lsr}} = 64$~km~s$^{-1}$.
 \end{table}