1. test

$\boxed{{\begin{array}{cccc}16&02&03&13\\
05&11&10&08\\
09&07&06&12\\
04&14&15&01\\Figure\ 1\end{array}}\\}$

$\boxed{{\begin{array}{ccccc}16&02&03&13&\\
05&11&10&08&\\
09&07&06&12&\\
04&14&15&01&Figure\ 1\end{array}}\\}$

$\boxed{
\begin{array}{cccc}
16 & 02 & 03 & 13 \\
05 & 11 & 10 & 08 \\
09 & 07 & 06 & 12 \\
04 & 14 & 15 & 01
\end{array}
}
$

3. This?

$\boxed{\begin{array}{c}\begin{array}{cccc}16&02&03 &13\\
05&11&10&08\\
09&07&06&12\\
04&14&15&01\end{array}\\\\\text{Figure}\ 1\end{array}}$

4. I didn't know you were testing in another thread... anyway, I got what undefined did but without all those backslashes by using '&' which sends it to the centre directly. It's in your other thread. I'll try again here without the space which seems like an empty row.

$\boxed{\begin{array}{c}\begin{array}{cccc}16&02&03 &13\\
05&11&10&08\\
09&07&06&12\\
04&14&15&01\end{array}\\ & \text{Figure}\ 1\end{array}}$

Without this empty row:

$\boxed{\begin{array}{c}\begin{array}{cccc}16&02&03 &13\\
05&11&10&08\\
09&07&06&12\\
04&14&15&01\end{array} & \text{Figure}\ 1\end{array}}$

5. Just for fun here is another way

$
\begin{array}{|c|}
\hline
\begin{array}{cccc}
16 & 02 & 03 & 13 \\
05 & 11 & 10 & 08 \\
09 & 07 & 06 & 12 \\
04 & 14 & 15 & 01 \end{array}
\\ & \text{Figure}\ 1 \\
\hline
\end{array}$

6. Gentlemen,

I've been doing testing as I'm preparing my next article.

A nagging problem with my email draft is that numbers and other characters get jumbled up whether it's through transmission to others or on an email preview. I had figured it was worth testing the boxing command to hold everything together and all I would risk is that the box itself would be moved around while its contents would remain aligned.

I believe that the problem is fixed now and I thank you for your help.