\begin{table}%t1
\caption{\label{tab_pardesc}Description of the output parameters of {\em CIGALE}.}     
%\centering
\small
\begin{tabular}{l l l l}
\hline\hline
Par. & Unit & Description & Dependencies \\
\hline
$Z$ & --- & metallicity (${Z}_\odot = 0.02$) & basic \\
$\tau_{\rm oSP}$ & Gyr & $e$-folding time for & basic \\
& & old SP model & \\
$t_{{\rm oSP}}$ & Gyr & age of old SP model & basic \\
$\tau_{\rm ySP}$ & Gyr & $e$-folding time for & basic \\
& & young SP model & \\
$t_{{\rm ySP}}$ & Gyr & age of young SP model & basic \\
$f_{\rm burst}$ & --- & mass fraction of & basic \\
& & young SP model & \\
$t_{{\rm M}}$ & Gyr & mass-weighted age & dep. on SP par. \\ 
$t_{{\rm D4000}}$ & Gyr & D4000-related age & dep. on SP par. \\
$\lambda_0$ & \AA{} & central wavelength of & basic \\
& & UV bump & \\
$\gamma$ & \AA{} & {\it FWHM} of UV bump & basic \\
$E_{\rm bump}$ & --- & amplitude of UV bump & basic \\ 
$c_{\rm R}$ & --- & change of $R_V$ & basic \\ 
$\delta$ & --- & slope correction of & basic \\
& & Calzetti law & \\
$A_{V,{\rm ySP}}$ & mag & $V$-band attenuation & basic \\
& & for young SP model & \\ 
$f_{\rm att}$ & --- & reduction of $A_V$ & basic \\
& & for old SP model & \\
$A_{\rm FUV}$ & mag & attenuation at 1500 \AA{} & dep. on SP and \\
& & & attenuation par. \\
$A_V$ & mag & attenuation at 5500 \AA{} & dep. on SP and \\
& & & attenuation par. \\
$\alpha$ & --- & slope of IR model & basic \\
$N_{\rm AGN}$ & --- & number of AGN model & basic \\
$f_{\rm AGN}$ & --- & $L_{\rm dust}$ fraction of & basic \\ 
& & AGN model & \\
$N_{\rm emlin}$ & --- & template number for & dep. on SP and \\
& & optical lines & attenuation par. \\
$N_{\rm abslin}$ & --- & template number for & dep. on SP and \\
& & UV lines & attenuation par. \\
$M_{\rm gal}$ & $M_\odot$ & galaxy mass & scaling par. \\
$M_{\rm star}$ & $M_\odot$ & total stellar mass & dep. on SP par. \\
& & & and $M_{\rm gal}$ \\
{\it SFR} & $M_\odot$/yr & instantaneous SFR & dep. on SP par. \\
& & & and $M_{\rm gal}$ \\
$L_{\rm bol}$ & $L_\odot$ & bolometric luminosity & dep. on all basic \\
& & & par. and $M_{\rm gal}$ \\
$L_{\rm dust}$ & $L_\odot$ & dust luminosity & dep. on all basic \\
& & & par. and $M_{\rm gal}$ \\
\hline
\end{tabular}
\end{table}