\begin{table}%t2
\caption{\label{tab:fits}Parameters of least-squares fits of surface brightness
vs. \vk\ or spectral type (see text and footnote on the title page).}
\small%\centering
\par
\begin{tabular}{rccr@{}c@{}l@{\hspace{4mm}}l@{\hspace{2mm}}l@{\hspace{2mm}}r@{\hspace{2mm}}r@{\hspace{2mm}}r@{\hspace{2mm}}r@{\hspace{3mm}}r@{\hspace{3mm}}r}
\hline  \hline \noalign{\smallskip} 
(1)  & (2)  &  (3)     &\multicolumn{3}{c}{(4)}      & \multicolumn{2}{c}{\hspace{-3mm}(4)} & (5)   & (6)   & (7)   & (8)   & (9)   & (10)  \\
Line & Dep. & Indep.   &\multicolumn{3}{c}{Range of} & \multicolumn{2}{c}{\hspace{-3mm}SpT} & $a_0$ & $a_1$ & $a_2$ & $a_3$ & $a_4$ & $a_5$ \\
     & Var. & variable &\multicolumn{3}{c}{Ind.Var.} & from &      to          &       &       &       &       &       &       \\ 
\noalign{\smallskip}\hline\noalign{\smallskip} 
1 &$S_{\rm K}$        &$V$--$K$&0&--&8.5 &A0&M8&   2.739 &  0.39318 &$-0.024337$&$0.00150594$             &                  &\\
2 &$S_{\rm I_{\rm c}}$&$V$--$K$&0&--&8.5 &A0&M8&   2.735 &  0.96065 &$-0.026441$&$-0.00455350$&$5.36349\times 10^{-4}$     &\\
3 &$S_{\rm R_{\rm c}}$&$V$--$K$&0  &--&8.5 &A0&M8& 2.750 &  1.13296 &$-0.011563$&$-0.00020917$&                  &\\
4 &$S_{\rm V}$        &$V$--$K$&0&--&8.5 &A0&M8&   2.777 &  1.33603 &$-0.006106$&             &                  &\\
5 &$S_{\rm K}$        &$X$  &             58&--&21   & A0&K7         &   9.523 &$-0.68789$&  0.032091 &$-0.00076551$&$9.08518\times 10^{-6}$&$-4.31289\times 10^{-8}$\\
6 &$S_{\rm K}$        &$X$  &             21&--&13.5 & K7&M6.5       &  17.175 &$-1.73019$&  0.078260 &$-0.00125491$&                  &\\
7 &$S_{\rm K}$        &$X$  &  13.5&--&2 & M6.5&L8     &   9.651 &$-0.88541$&  0.068535 &$-0.00211177$&                  &\\
8 &$S_{\rm I_{\rm c}}$&$X$  &             58&--&21   & A0&K7         &  19.534 &$-1.49122$&  0.060071 &$-0.00124465$&$1.29388\times 10^{-5}$&$-5.47581\times 10^{-8}$\\
9 &$S_{\rm I_{\rm c}}$&$X$  &             21&--&14   & K7&M6         &  36.892 &$-3.90214$&  0.164778 &$-0.00239313$&                  &\\
10 &$S_{\rm I_{\rm c}}$&$X$ &  14&--&6 & M6&L4         &  14.311 &$-0.73014$&  0.061393 &$-0.00294611$&                  &\\
11 &$S_{\rm R_{\rm c}}$&$X$ &             58&--&21   & A0&K7         &  37.781 &$-3.79580$&  0.178183 &$-0.00422544$&$4.97703\times 10^{-5}$&$-2.33252\times 10^{-7}$\\
12 &$S_{\rm R_{\rm c}}$&$X$ &             21&--&14   & K7&M6         &  75.285 &$-9.65487$&  0.466505 &$-0.00777256$&                  &\\
13 &$S_{\rm R_{\rm c}}$&$X$ &  14&--&6 & M6&L4         &  19.916 &$-1.83017$&  0.177753 &$-0.00690745$&                  &\\
14 &$S_{\rm V}$        &$X$ &             58&--&21   & A0&K7         &  58.160 &$-6.16978$&  0.288325 &$-0.00671549$&$7.71455\times 10^{-5}$&$-3.50806\times 10^{-7}$\\
15 &$S_{\rm V}$        &$X$ &             21&--&14   & K7&M6         &  94.817 &$-12.2938$&  0.592793 &$-0.00982453$&                  &\\
16 &$F_{7500}$        &$X$  &              48&--&37  & A0&K1         &$-284.141$& 24.7680 &$-0.656394$&  0.00649903 &                  &\\
17 &$F_{7500}$        &$X$  &             36&--&16   & K1&M4         &  60.251 &$-9.99437$&  0.513712 &$-0.00665634$&                  &\\
18 &$F_{7500}$        &$X$  &          16&--&9&M4+&M9.5&$-21.130$&  6.27287 &$-0.620218$&0.02054700 &                  &\\
19 &$F_{\rm TiO}$         &$X$  &              21&--&15  & K6&M4.5       &$-193.229$& 29.87220 &$-1.487030$&  0.02411810 &                  &\\
20 &$F_{\rm TiO}$         &$X$  &         15&--&9&M4.5&M9.5&$-1.977$ & 0.99973 &$-0.140786$&  0.00610879 &                  &\\
\hline 
\end{tabular}
\end{table}