Y Offset changes by 2.20813 microns/K.  The Y Offset parameters given
below are for 155.1325 K.  The focal length doesn't vary with
temperature. 

\begin{center}
\begin{tabular}{|c | r | c |}  \hline 
Module  &  Y Offset (cm)  &  Focal Length (cm) \\ \hline
1a  &   0.15899934363657  &   22.63856699014887\\ \hline
2a  &  -0.75062088800908  &   22.67036383823271\\ \hline
1b  &   0.15948686490009  &   22.63415228713424\\ \hline
2b  &  -0.81061203842407  &   22.66343337704575\\ \hline
4a  &  -1.26071851132718  &   22.68708035039627\\ \hline
4b  &  -0.63979891894052  &   22.66396896172408\\ \hline
3   &   0.24858066379395  &   22.68305092772815\\ \hline
4c  &  -1.21165291754235  &   22.68828582122717\\ \hline
4d  &  -0.64069251920575  &   22.66778828188385\\ \hline
5   &  -1.84600650507790  &   22.68328350468313\\ \hline
6   &  -0.94846341099416  &   22.63185895385343\\ \hline
7   &   0.09553004289672  &   22.63802485294781\\ \hline
8   &   1.03405320624567  &   22.69067417466205\\ \hline
9   &  -1.84786498453398  &   22.71830150217634\\ \hline
10  &  -0.91062505275669  &   22.67426750605975\\ \hline
11  &   0.13313918668872  &   22.65355245084638\\ \hline
12  &   0.95575229629546  &   22.71060292637189\\ \hline
\end{tabular}
\end{center}
\caption{Grating model parameters.}
\end{table}