\begin{table}%t2
\caption{\label{flusso}Micrometeoritic flux obtained by Cintala and BM model
with Love and Brownlee and $Gr\ddot{u}n$ calibration in the range
$5{-}100\ \mu $m.}
%\centering
  \small
\begin{tabular}{ccc}
\hline
\hline
Model &   $\frac{N}{\rm year}$ &    $\frac{g}{\rm cm^{2}~s}$\\
\hline\noalign{\smallskip}
 Cintala's model & $4.073\times 10^{16}$   &  $1.402\times 10^{-16}$\\
 Borin model (LB calibration) &  $3.104\times 10^{18}$   & $2.382\times 10^{-14}$\\
 Borin model (G calibration) & $4.596\times 10^{17}$  &  $8.982\times 10^{-15}$ \\
\hline
\end{tabular}
\end{table}