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\newcommand{\ie}{\textit{i.e.}}
\newcommand{\EFCI}{E_\text{FCI}}
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\newcommand{\Pop}{6-31+G(d)}
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\newcommand{\IneV}[1]{#1 eV}
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\newcommand{\InAA}[1]{#1 \AA}
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\newcommand{\pis}{\pi^\star}
\newcommand{\Ryd}{\mathrm{R}}
\newcommand{\Val}{\mathrm{V}}
\newcommand{\LCPQ}{Laboratoire de Chimie et Physique Quantiques, CNRS et Universit\'e Toulouse III - Paul Sabatier, 118 route de Narbonne, 31062 Toulouse, France}
\newcommand{\CEISAM}{Universit\'e de Nantes, CNRS,  CEISAM UMR 6230, F-44000 Nantes, France}
\newcommand{\Pisa}{Dipartimento di Chimica e Chimica Industriale, University of Pisa, Via Moruzzi 3, 56124 Pisa, Italy}

\begin{tabular}{l|p{.5cm}p{1.0cm}p{1.2cm}p{1.4cm}|p{.5cm}p{1.0cm}p{1.2cm}p{1.4cm}|p{.5cm}p{1.0cm}p{1.2cm}|p{.5cm}|p{.5cm}|p{.6cm}p{.6cm}}
  & \multicolumn{12}{c}{Methylenecyclopropene}\\
  & \multicolumn{4}{c}{\Pop} & \multicolumn{2}{c}{\AVDZ}& \multicolumn{3}{c}{\AVTZ}  &  \multicolumn{3}{c}{Litt.}\\
State 	& {\CCT} & {\CCSDT} & {\CCSDTQ}  & {\FCI} & {\CCT}  &  {\CCSDT}& {\CCT} & {\CCSDT}   & {\NEV}& Th.$^c$ & Th.$^d$ & Exp.$^e$\\
$^1B_2 (\pi \ra \pis)$		&4.38&4.37&4.34& 4.32$\pm$0.03		&4.32&4.31	&4.31&4.31  &4.37	&4.13&4.36	&4.01\\
$^1B_1 (\pi \ra 3s)$		&5.65&5.66&5.66& 					&5.35&5.35	&5.44&5.44  &5.49	&5.32&5.44	&5.12\\
$^1A_2 (\pi \ra 3p)$		&5.97&5.98&5.98& 5.92$\pm$0.10		&5.86&5.88	&5.95&5.96  &6.00	&5.83&		&\\
$^1A_1(\pi \ra  \pis)$ $^f$	&6.17&6.18&6.17& 6.20$\pm$0.01		&6.15&6.15	&6.13&6.13  &6.36	&	&6.13	&6.02\\
$^3B_2 (\pi \ra \pis)$		&3.50&3.50&       & 3.44$\pm$0.06		&3.49&3.49$^g$&3.50&3.49 &3.66	&3.24&		&\\
$^3A_1 (\pi \ra \pis)$		&4.74&4.74&       & 4.67$\pm$0.10		&4.74&4.74$^g$&4.74&        &4.87	&4.52&		&\\
\end{tabular}