[Tex/LaTex] Removing vertical lines from the table header

Question

This is what I already have, but for the moment. In the left corner and the right corner there are two little vertical lines, I don't want them, but I don't know how to delete them. Anyone who can help me please?

\documentclass{standalone}
\usepackage[utf8]{inputenc}
\usepackage[math]{iwona}
\usepackage{eurosym}
\begin{document}
    \begin{tabular}{|c l l r|}
          & \huge{\textsterling} & \Large{\EUR{}} & \$ \\ \hline
        \textsterling & 10 & 8,9 & 6,2 \\ \hline \hline
        \EUR{} & 11,3 & 10 & 7,0 \\ \hline \hline
        \$ & 16,2 & 14,3 & 10 \\ \hline
    \end{tabular}
\end{document}

---

This is what I need to become. So it are just the two little lines in each corner that I need to delete. But I don't know how 🙁

And as you can see, I really need the horizontal lines, because it is an exercise…

Answer 1

You can overwrite the vertical rule spec via \multicolumn. Still the result is not very satisfactory and you might choose a different strategy via boxing the contents e.g. see Highlight a table row with a rectangular overlay etc.

\documentclass[border=3mm]{standalone}
\usepackage{eurosym}
\begin{document}
    \begin{tabular}{|c l l r|}
        \multicolumn{1}{c}{} & \huge{\textsterling} & \Large{\EUR{}} & \multicolumn{1}{c}{\huge \$}\\\hline
        \textsterling        & 10                   & 8,9            & 6,2\\ \hline \hline
        \EUR{}               & 11,3                 & 10             & 7,0\\ \hline \hline
        \$                   & 16,2                 & 14,3           & 10 \\ \hline
    \end{tabular}
\end{document}