\begin{table}%t1
\caption{\label{caliblang}Calibration used for the classification of the star$^{1}$.}
%\centerline
 {
\begin{tabular}{llll}
\hline
\hline	
ST  & Mv Range & ST  & Mv Range \\
\hline	
Hot O &  $<$--6.0     &  B6  &  [--0.6; --0.25[ \\
O3  &  [--6.0; --5.9[  &  B7  &  [--0.25; 0.025[ \\
O4  &  [--5.9; --5.7[  &  B8  &  [0.025; 0.285[\\
O5  &  [--5.7; --5.5[  &  B9  &  [0.285; 0.43] \\
O6  &  [--5.5; --5.2[  &  A0  &  ]0.43; 1.0[\\
O7  &  [--5.2; --4.9[  &  A1  &  [1.0; 1.3[ \\
O8  &  [--4.9; --4.5[  &  A2  &  [1.3; 1.5[\\
O9  &  [--4.5; --4.2[  &  A3-A4  &  [1.5; 1.95[\\
B0  &  [--4.2; --3.25[  &  A5-A6  &  [1.95; 2.2[\\
B1  &  [--3.25; --2.55[ &  A7  &  [2.2; 2.4[\\
B2  &  [--2.55; --1.8[ &  A8-A9  &  [2.4; 2.55[\\
B3  &  [--1.8; --1.4[  &  F0-F1  &  [2.55; 3.6[\\
B4  &  [--1.4; --0.95[  &  cool F  &  $\ge$3.6 \\
B5  &  [--0.95; --0.6[  &  \\
\hline
\end{tabular}}
\medskip
$^{1}${\scriptsize The classification is based on ranges in absolute $V$ magnitude per spectral 
sub-type, following the calibration of \citet{lang1992} and 
\citet[][ and references therein]{wis2006} for main-sequence stars.}  
\end{table}