\begin{table}%t5
\caption{Column densities (cm$^{-2}$) from assorted MHD shock calculations applied to $\zeta$ Persei.}\label{obsh}
%\centering
\par
\begin{tabular}{lccccc}
\hline
\hline
Species & 1 shock $v=11$ km s$^{-1}$ & 9 shocks $v=8$ km$^{-1}$ & 3
shocks $v= 9$ km$^{-1}$ &
Observation \\
\hline
CO & 2.1(12) & 5.2(12)   & 2.2(12)  & 5.4(14) & \\
CH & 1.1(12) &  3.0(12)  & 6.7(12)   & 2.0(13) & \\
CH$^{+}$ & 4.0(12) & 3.0(12)  & 3.9(12)  & 3.5(12)  \\
C$_{2}$ & 1.1(10) & 3.4(10)  & 6.6(10)   & 1.9(13) &\\
C$_{3}$ & 9.8(6)  & 2.5(7)  & 1.7(7)  & 1.0(12)   \\
CN & 4.6(10) &  4.9(10) & 5.2(10)  & 3(12)  \\
NH & 7.9(9) & 4.9(8)  & 1.4(9)  & 9.0(11)   \\
OH & 1.3(13) & 1.7(13)  & 1.1(13) & 4.0(13)   \\
H$_{3}^{+}$ & 1.3(12) & 3.4(11)  & 1.4(11)  & 8.0(13) & \\
H & 1.5(18) &  1.4(19) & 9.5(18)  & 6.2(20)   \\
H$_{2}$ & 7.2(17) & 6.3(18)  & 4.4(18) & 4.6(20)  \\
H$_{2}$ ($J=$ 0) & 1.4(17) &  1.5(18) & 8.9(17)  & 3.5(20)  \\
      H$_{2}$ ($J=$ 1) & 3.6(17) &  3.6(18) & 2.9(18)  & 1.6(20)  \\
      H$_{2}$ ($J=$ 2) & 9.5(16) & 7.6(17)  & 4.6(17)  & 2.4(18)  \\
      H$_{2}$ ($J=$ 3) & 1.1(16) & 4.0(17)  & 1.6(17)  & 9.6(16)  \\
      H$_{2}$ ($J=$ 4) & 6.4(15) & 1.1(16)  &  3.9(15)  & 2.0(15) \\
      H$_{2}$ ($J=$ 5) & 1.8(15) & 1.1(15)  &  3.6(14)  & 2.8(14) \\
Length (pc) & 0.028 & 0.25 & 0.074 & \\
$A_{\rm v}$ & 0.015 & 0.14 & 0.036& \\
\hline
\end{tabular}
\end{table}