\begin{table}%t1
\caption{\label{tab1}Physical parameters and function~$f(\delta_{\rm m})$ for different materials.}
\small%\centerline
 {
\begin{tabular}{llllc}%{ll|l|l|c}
\hline\hline 
%&&&& \\[-8pt]
Material&$\delta_{\rm m}$,&$c \times 10^{7}$,&$\lambda$,&$f(\delta_{\rm m})$\\
&g~cm$^{-3}$&erg~g$^{-1}$~deg$^{-1}$&erg~s$^{-1}$~cm$^{-1}$~deg$^{-1}$&\\
\hline
%&&&& \\[-8pt]
Brick (Kizel'gur)&0.40&0.75&$9.3\times 10^{3}$&8.72\\
Sand (river)&1.52&0.70&$2.7\times 10^{4}$&9.39\\
Sandstone&2.45&0.93&$1.7\times 10^{5}$&9.93\\
Schist&2.67&0.71&$1.5\times 10^{6}$&10.13\\
Granite&2.70&0.65&$2.5\times 10^{5}$&10.15\\
Basalt&2.90&0.85&$2.0\times 10^{5}$&10.20\\
Fluorit&3.20&0.85&$1.0\times 10^{6}$&10.25\\
Fyalit&4.40&0.55&$2.0\times 10^{6}$&10.52\\
Gematit&5.26&0.61&$2.4\times 10^{5}$&10.66\\
Arsenopirit&6.07&0.43&$3.8\times 10^{6}$&10.82\\
Iron$^{*}$
&7.60&0.44&$7.3\times 10^{6}$&11.00\\
\hline
\end{tabular}}
\medskip
$^{*}$ Values of $f(\delta_{\rm m})$ is given for $\Lambda=0.75$.
\end{table}