# Suppress spaces between column entry and newly defined column separator

As explained in another post I have defined a column separator as follows:

\newcolumntype{"}{@{\hskip\tabcolsep\vrule width 1pt\hskip\tabcolsep}}


With the normal separator | I used @{} to make column entry one next the other. This is not working anymore: is there a way to make it work also in with the new separator?

As minimal complete working example, in the first table the text Round is spaced away from the separator, while in the second the text is next to it:

\documentclass[a4paper,twoside]{article}

\usepackage{epsfig}
\usepackage{subfigure}
\usepackage{calc}
\usepackage{amssymb}
\usepackage{amstext}
\usepackage{amsmath}
\usepackage{amsthm}
\usepackage{multicol}
\usepackage{pslatex}
\usepackage{apalike}
\usepackage{ulem}
\usepackage{tabularx}
\makeatletter
\newcommand{\thickhline}{%
\noalign {\ifnum 0=}\fi \hrule height 1.2pt
\futurelet \reserved@a \@xhline
}
\newcolumntype{"}{@{\hskip\tabcolsep\vrule width 1pt\hskip\tabcolsep}}
\makeatother

\begin{document}

\title{Title}
\maketitle
\begin{table} % Add the following just after the closing bracket on this line to specify a position for the table on the page: [h], [t], [b] or [p] - these mean: here, top, bottom and on a separate page, respectively
\centering % Centres the table on the page, comment out to left-justify
\tiny
\begin{tabular}{@{}c@{}" c@{ }|@{ }c " c@{}|@{}c  " c@{}|@{}c" c@{}|@{}c}
%\toprule % Top horizontal line
\textbf{\footnotesize{Round}} & \multicolumn{8}{c}{\textbf{\footnotesize{Test run}}} \\ % Amalgamating several columns into one cell
%\cline{2-9}
%\cmidrule(l){2-5} % Horizontal line spanning less than the full width of the table - you can add (r) or (l) just before the opening curly bracket to shorten the rule on the left or right side
& \multicolumn{2}{c"}{\textbf{1}} & \multicolumn{2}{c"}{\textbf{2}} & \multicolumn{2}{c"}{\textbf{3}} & \multicolumn{2}{c}{\textbf{4}}\\ % Column names row
%\cline{2-9}
& devices&users & devices&users & devices&users & devices&users\\
\thickhline

\textbf{1} & $440$                &    $10$    & $440$               &   $10^2$      & $440$        &           $10^3$     & $440$           &           $10^4$

\end{tabular}
\caption{Table caption text}
\label{tab:template}
\end{table}

\begin{table}
\centering
\tiny
\begin{tabular}{@{}c@{}| c@{ }|@{ }c " c@{}|@{}c  " c@{}|@{}c" c@{}|@{}c}

\textbf{\footnotesize{Round}} & \multicolumn{8}{c}{\textbf{\footnotesize{Test run}}} \\ % Amalgamating several columns into one cell

& \multicolumn{2}{c"}{\textbf{1}} & \multicolumn{2}{c"}{\textbf{2}} & \multicolumn{2}{c"}{\textbf{3}} & \multicolumn{2}{c}{\textbf{4}}\\
& devices&users & devices&users & devices&users & devices&users\\
\thickhline

\textbf{1} & $440$                &    $10$    & $440$               &   $10^2$      & $440$        &           $10^3$     & $440$           &           $10^4$

\end{tabular}
\caption{Table caption text}
\label{tab:template}
\end{table}

\end{document}


\newcolumntype{"}{!{\vrule width 1pt}}

\newcolumntype{"}{@{\hskip\tabcolsep\vrule width 1pt\hskip\tabcolsep}}

! is like @ but does not suppress the automatic \tabcolsep space,so an adjacent @{}` does suppress it.