\begin{table}%t4
\caption{\label{tab: spectral slopes}Spectral slopes at mm~wavelengths, dust disc masses, and properties of the 10-$\mu$m silicate feature. }
\par
%\centering
\par
\begin{tabular}{lcccccc}
\hline \hline \noalign{\smallskip}
	   Source					& $\alpha_{1-3}$			& $\alpha_{3-7}$			& Dust disc mass\tablefootmark{a}	& Strength \citep{furlan:2006}			& Strength $F^{10\mu m}_{\rm peak}$				& Shape			\\
&					&					& ($10^{-4}~M_\odot$)		& ($F_{10}-F_{\rm cont}$)/$F_{\rm cont}$	& max($1+\frac{(F_\nu - F_{\rm \nu, c})}{(F_{\rm \nu, c})}$)	& $F_{11.3}$/$F_{9.8}$	\\
\noalign{\smallskip}\hline
HBC~553					& ...					& ...					& ...				& 0.22		& 1.43						& 0.86			\\
HBC~556					& ...      				& ...	 & ${<}5.1$			& 0.40			& 1.64						& 0.99			\\
HBC~557					& ...      				& ...	 & ${<}4.4$			& 0.21			& 1.37						& 0.95			\\
HBC~559					& ...      				& ...	 & ${<}4.0$			& 0.39			& 1.60						& 0.85			\\
HBC~560					& ...					& ...					& ...				& 0.29		& 1.44						& 1.03			\\
HBC~561					& ...					& ...					& ...				& 0.43		& 1.67						& 0.90			\\
\hline \noalign{\smallskip}	
	   SZ~Cha					& $3.8 \pm 0.4$\tablefootmark{b}		& ...	  			& 0.6				& 0.71						& 2.30							& 0.85			\\
Sz~32					& ${>}3.7$\tablefootmark{b}& ${<}1.8$  				& ${<}0.8$			& 0.14			& 1.24						& 1.11			\\
\hline\noalign{\smallskip}
IK~Lup					& $2.7 \pm 0.3$\tablefootmark{b}		& ...			& 0.7				& 0.36		& 1.51						& 0.93			\\
Sz~66					& $1.9 \pm 0.2$\tablefootmark{b}		& ...			& 0.4				& 0.40		& 1.62						& 0.92			\\
HM~Lup					& ...					& ...					& ...				& 0.50		& 1.81						& 0.85			\\
Sz~73					& ...					& ...					& ...				& 0.26		& 1.38						& 0.95			\\
HN~Lup					& ...					& ...					& ...				& 0.18		& 1.29						& 1.03			\\
Sz~76					& ...					& ...					& ...				& 0.45						& 1.77							& 0.77			\\
Sz~77					& ...					& ...					& ...				& 0.43		& 1.63						& 0.94			\\
IM~Lup					& $3.6 \pm 0.4$\tablefootmark{b}		& $1.8 \pm 0.3$				& 1.7				& 0.52						& 1.81							& 0.85			\\
	   RY~Lup					& $3.8 \pm 0.5$				& ${>}2.0$	  			& 0.5				& 1.10						& 3.16							& 0.66			\\
	   MY~Lup					& $2.1 \pm 0.5$				& ${>}3.5$  				& 1.7				& 0.54						& 1.87							& 0.79			\\
	   EX~Lup					& ...					& ...					& ...				& 0.54						& 2.01							& 0.73			\\
	   Sz~96					& ...					& ...					& ...				& 0.78						& 2.30							& 0.82			\\
	   Sz~102					& ...					& ...					& ...				& 0.80						& 2.36							& 0.82			\\
	   Sz~111					& $2.5 \pm 0.4$				& ${>}2.9$  				& 1.1				& ...						& ...							& ...			\\
	   SSTc2d~J161029.57-392214.7\tablefootmark{h}	& ...					& ...					& ${<}0.3$			& 0.29						& 1.52							& 0.89			\\
	   SSTc2d~J161159.81-382338.5			& ...					& ...					& ${<}0.3$			& 0.92						& 2.48							& 0.84			\\
	   RX~J1615.3-3255				& $3.4 \pm 0.5$				& ${>}3.4$  				& 1.3				& 1.25						& 3.04							& 0.96			\\
\hline	
VV~Ser					& ...					& ...	       				& ${<}1.0$			& 0.33			        		& 1.45							& 0.97			\\
	   SSTc2d~J182850.20+000949.7			& ...					& ...	       				& ${<}1.1$			& 0.36						& 1.57							& 0.88			\\
	   SSTc2d~J182900.88+002931.5			& $2.4 \pm 0.4$				& ...	 				& 2.0				& 0.15						& 1.27							& 0.96			\\
	   CoKu~Ser-G3					& ...					& ...	       				& ${<}1.0$			& -0.09			        		& 0.82							& 1.17			\\
	   IRAS~18268-0025				& ...					& ...					& ${<}0.7$			& 0.48						& 1.67							& 1.14			\\
	   SSTc2d~J182944.10+003356.1\tablefootmark{i}	& ...					& ...					& ${<}0.7$			& 0.30						& 1.53							& 0.96			\\
	   EC~82 aka CK~3				& ...					& ...	 				& ${<}1.7$			& 1.41						& 3.55							& 0.67			\\
	   EC~90 aka CK~1				& $2.5 \pm 0.5$				& ...	 				& 6.7				& 0.26						& 1.40							& 1.12			\\
	   EC~97 aka CK~4				& ...					& ...					& ...				& 0.34						& 1.56							& 0.90			\\
	   GSC~00446-00153				& $3.0 \pm 0.5$				& ...	 				& 4.0				& ...						& ...							& ...			\\
\hline \noalign{\smallskip}
S~CrA					& $2.9 \pm 0.7$\tablefootmark{e}		& $2.5 \pm 0.4$				& 3.6				& 0.34						& 1.51							& 0.97			\\
	   DG~CrA					& ...					& ...	  				& ${<}0.4$			& 1.04						& 2.94							& 0.67			\\
	   VV~CrA					& $2.5 \pm 0.5$\tablefootmark{d,e,f,g}	& $2.4 \pm 0.5$\tablefootmark{g}		& 3.9				& ...						& ...							& ...			\\
\hline
\end{tabular}
\tablefoot {\tablefoottext{a}{Dust disc masses estimated from ATCA and CARMA fluxes, assuming a dust opacity $\kappa_\nu = 0.9$~cm$^2$~g$^{-1}$ \cite[cf.][]{beckwith:1990}, and a~dust temperature $T_{\rm dust} = 25$~K.} \\
\tablefoottext{b}{Using the SEST 1.27~mm (single-dish) flux from \citet{nurnberger:1997}.} \\
\tablefoottext{c}{Using the SEST 1.27~mm (single-dish) flux from \citet{henning:1993}.} \\
\tablefoottext{d}{Using the SEST 1.20~mm (single-dish) flux from \citet{chini:2003}.} \\
\tablefoottext{e}{Using the SEST 1.27~mm (single-dish) flux from \citet{henning:1994}.} \\
\tablefoottext{f}{Taking a combined flux of 50.2~mJy at 3.17~mm.} \\
\tablefoottext{g}{Using the PSF extraction method for the Spitzer IRS spectrum.} \\
\tablefoottext{h}{Observed with Spitzer IRS for Program ID~30843 (B.~Mer{\'{\i}}n PI). The full IRS spectrum will be presented in Mer{\'{\i}}n et~al. (2010, in~prep.).} \\
\tablefoottext{i}{Observed with Spitzer IRS for Program ID 30223 (K.M.~Pontoppidan PI). The full IRS spectrum will be presented in Oliveira et~al. (2010, in~prep.).}}
\vspace*{3mm}
\end{table}