I want to make a table in LaTeX and I wrote the following program:

```
\documentclass[]{article}
\usepackage{graphicx}
\usepackage{color}
\begin{document}
\begin {center}
\begin {tabular}{| l | l | l | l | l | l |}
\cline{2-6}
& \multicolumn{5}{ |c| }{$\eta_{\infty}$} \\ \cline{2-6}
& i=1,f=6 & i=1,f=3 & i=3,f=5& i=4,f=2& i=6,f=3 \\ \hline
$k,l=0,0$ & \textcolor{blue}{0.1811} & \textcolor{blue}{0.1811}& \textcolor{blue}{0.1811}& \textcolor{blue}{0.1811}& \textcolor{blue}{0.1811} \\ \hline
$k,l=1,2$ &0.3788 &0.3788 &0.2898 &0.2220 &0.2898 \\ \hline
$k,l=1,3$ &0.3788 &\textcolor{red}{0.9393} &0.2898 &0.2898 &0.2220 \\ \hline
$k,l=1,4$ &0.3788 &0.3788 &0.2898 &0.3788 &0.2898 \\ \hline
$k,l=1,5$ &0.3788 &0.3788 &0.2220 &0.2898 &0.2898 \\ \hline
$k,l=1,6$ &\textcolor{red}{0.9393} &0.3788 &0.2898 &0.2898 &0.3788 \\ \hline
$k,l=2,3$ &0.2898 &0.2220 &0.3788 &0.2220 &0.2220 \\ \hline
$k,l=2,4$ &0.2898 &0.2898 &0.2898 &\textcolor{red}{0.9393} &0.2898 \\ \hline
$k,l=2,5$ &0.2898 &0.2898 &0.2220 &0.2220 &0.2898 \\ \hline
$k,l=2,6$ &0.2220 &0.2898 &0.2898 &0.2220 &0.3788\\ \hline
$k,l=3,4$ &0.2898 &0.2220 &0.3788 &0.3788 &0.2220 \\ \hline
$k,l=3,5$ &0.2898 &0.2220 &\textcolor{red}{0.9393} &0.2898 &0.2220 \\ \hline
$k,l=3,6$ &0.2220 &0.2220 &0.3788 &0.2898 &\textcolor{red}{0.9393} \\ \hline
$k,l=4,5$ &0.2898 &0.2898 &0.2220 &0.3788 &0.2898 \\ \hline
$k,l=4,6$ &0.2220 &0.2898 &0.2898 &0.3788 &0.3788 \\ \hline
$k,l=5,6$ &0.2220 &0.2898 &0.2220 &0.2898 &0.3788 \\ \hline
\end {tabular}\\
Table 2: System efficiency for different k,l and i,f.
\end {center}
\end{document}
```

Some of the cells have an extra vertical line in the first column, how can I omit it?

Thank you for your soon answering!

## Best Answer