# 6 authors, groups of 3 for a shared affiliation in ACM Sig-proc

I must create a paper with 6 authors in total the first three share one affiliation, and likewise the second three share a common affiliation.

In accordance with the answer to this question I've been attempting to render it in an aesthetically appealing way, using this code:

    \numberofauthors{6} %  in this sample file, there are a *total*
% of EIGHT authors. SIX appear on the 'first-page' (for formatting
% reasons) and the remaining two appear in the \additionalauthors section.

\author{
\alignauthor Ben King\\
\email{king@cs.berkeley.edu}
%
\alignauthor Georgia Tobin\\
\email{tobin@cs.berkeley.edu}
%
\alignauthor Gerald Murray\\
\email{murrray@cs.berkeley.edu}
%
\sharedaffiliation
\affaddr{Department of Electrical Engineering and Computer Science}  \\
\affaddr{University of California, Berkeley }   \\
%
\alignauthor Ben King\\
\email{king@cs.berkeley.edu}
%
\alignauthor Georgia Tobin\\
\email{tobin@cs.berkeley.edu}
%
\alignauthor Gerald Murray\\
\email{murrray@cs.berkeley.edu}
%
\sharedaffiliation
\affaddr{Department of Electrical Engineering and Computer Science}  \\
\affaddr{University of California, Berkeley }   \\
}


However as you can see in the photo below the result is quite a mess.

How can I create this in an orderly way? i.e. well aligned and centred.

Changing this

\def\sharedaffiliation{%
\end{tabular}
\centering
\begin{tabular}{c}}


for this

\def\sharedaffiliation{%
\end{tabular}
\centering
\begin{tabular}{p{\linewidth}}\centering}


Solved the problem for me, for the second row of authors.

\documentclass{sig-alternate}

%\usepackage{amssymb}
\setcounter{tocdepth}{3}

\usepackage{graphicx}
\usepackage{epstopdf}

\usepackage{%times,
paralist,
graphicx,
comment,
verbatim,
color,
%
tikz,
calc,
multirow
}
%\usepackage[official]{eurosym}
\usepackage[caption=false]{subfig}% or will mess up captioning...
%\usepackage{svg}%needs to come after subfig
\usepackage{hyperref}
\hypersetup{
pdftitle={},
pdfauthor={},
pdfkeywords={},
pageanchor=false,
bookmarksnumbered,
pdfstartview={FitH},
citecolor=black,
filecolor=black,
urlcolor=black,
}

\graphicspath{{figs/}}

\usepackage{url}
\urldef{\mailsa}\path|{english,sibarani,scerri}@iai.uni-bonn.de|
\urldef{\mailsb}\path|{g.buscher,f.bensberg}@hs-osnabrueck.de|

\noindent\keywordname\enspace\ignorespaces#1}

\newcommand{\etal}{~{\em et\,al.,}\,}
\newcommand{\saro}{{\em \sc the TSAR Ontology}}%only one of the styling command obeyed :S

\def\checkmark{\tikz\fill[scale=0.4](0,.35) -- (.25,0) -- (1,.7) -- (.25,.15) -- cycle;}

\def\sharedaffiliation{%
\end{tabular}
\begin{tabular}{c}}
%
\begin{document}
%
% --- Author Metadata here ---
\conferenceinfo{SEMANTiCS '16,}{September 12-15^{th} Leipzig, Germany}
%\CopyrightYear{2007} % Allows default copyright year (20XX) to be over-ridden - IF NEED BE.
%\crdata{0-12345-67-8/90/01}  % Allows default copyright data (0-89791-88-6/97/05) to be over-ridden - IF NEED BE.
% --- End of Author Metadata ---

\title{{\ttlit ACM} SIG Proceedings Paper in LaTeX
Format\titlenote{(Produces the permission block, and
SIG-ALTERNATE.CLS. Supported by ACM.}}

\title{Block Chain Technologies \& the Semantic Web: \\A Study in Symbiosis}

\numberofauthors{6}
\author{
\alignauthor S. Matthew English\\
\email{english@iai.uni-bonn.de}
%
\alignauthor Elisa M. Sibarani\\
\email{sibarani@iai.uni-bonn.de}
%
\alignauthor Simon Scerri\\
\email{scerri@iai.uni-bonn.de}
%
\sharedaffiliation
\affaddr{Fraunhofer-Institut f\"ur Intelligente Analyse und Informationssysteme IAIS}   \\
%
\and % go to new row
%
\alignauthor Elisa M. Sibarani\\
\email{sibarani@iai.uni-bonn.de}
%
\alignauthor S. Matthew English\\
\email{english@iai.uni-bonn.de}
%
\alignauthor Simon Scerri\\
\email{scerri@iai.uni-bonn.de}
%
\sharedaffiliation