
\subsubsection{The UneXplained Elevation (*.uxe) file}

The *.uve file is a specialized version of the generic m3d format. 
The format is: 
\begin{itemize}
\item[0)]  an arbitrary number of comment lines. 
\item[1)] XXXX ~~~~~~~ - the first required line  
\item[2)] mesh name ~~~  - e.g.\ test6   
\item[3)] comment
\item[4)] Year ~~~~~~     - e.g.\ 1995 
\item[5)] 4    ~~~~~~~~ - the number of columns 
\item[6)] An arbitrary number of data records.  
\end{itemize}
Each data record (a line) consists of 8 items: 
\begin{itemize}
\item time  -decimal days in UTC0 format (days from beginning of the year).
	     This is yrday0\_utc in the USGLOBEC Georges Bank Data Thesaurus.
\item xobs, yobs  - horizontal positions in same coordinate system as the FEM mesh.  Units: meters. 
\item eobs - elevation observation.  Units: m/s.  
\end{itemize}
Notes:
\begin{enumerate}
\item The elevation is assumed to be the deviation about mean sea level. 

\item 
The time is with respect to a particular year, where the year is
 given in the header.  Year boundaries are not a problem. 
 Let days in  
the previous year be negative and days in the following
year be greater than 365 (or 366 Year is a leap year). 

\item 
Casco will reject data which falls outside the mesh and the time
    window. 

\item 
Casco4 stops if the mesh name in the *.uxe file is not
identical to that in the *.ins file.

\item The data does not have to be sorted with respect to time, 
as Casco4 sorts the data internally.  However the output
will be sorted. 
\end{enumerate}

