\begin{table}%t9
\caption{\label{Grt_correl}Remarkable or interesting correlations of computed spectral gradients.}  
\small%\centerline
 {
\begin{tabular}{c c c c c c c c c c c}  
\hline\hline  
 & & & OWN & & & OWN+LP & & & OWN+LP+2MS &\\  
 & correlated magnitudes & $\rho$ & SL(\%) & $n$ & $\rho$ & SL(\%) & $n$ & $\rho$ & SL(\%) & $n$\\
\hline   
Classicals & Grt vs. $i$	&	$-$0.28	&	77.11	&	19	&	$-$0.49	&	99.95	&	52	&	$-$0.47	&	99.99	&	73	\\
& Grt vs. $i$ ($H_{R}>6.2$)	&	$-$0.68	&	90.35	&	7	&	$-$0.61	&	99.94	&	33	&	$-$0.66	&	99.99	&	38	\\
& Grt vs. $i$ ($H_{R}<6.2$)	&	$-$0.17	&	42.29	&	12	&	$-$0.37	&	88.47	&	19	&	$-$0.36	&	96.48	&	35	\\
& Grt vs. $\psi$&	0.12	&	37.68	&	19	&	$-$0.03	&	16.76	&	52	&	$-$0.08	&	48.26	&	73	\\
& Grt vs. $\psi$ ($H_{R}>6.2$)	&	$-$0.14	&	27.36	&	7	&	0.13	&	55.39	&	33	&	0.16	&	66.45	&	38	\\
& Grt vs. $\psi$ ($H_{R}<6.2$)	&	$-$0.20	&	49.88	&	12	&	$-$0.41	&	91.71	&	19	&	$-$0.40	&	97.90	&	35	\\
\hline
Hot & Grt vs. $Q$	&	$-$0.24	&	52.17	&	10	&	$-$0.04	&	17.01	&	27	&	$-$0.03	&	16.00	&	42	\\
& Grt vs. $Q$ ($H_{R}>6.2$)	&	$-$0.40	&	51.16	&	4	&	$-$0.30	&	75.93	&	16	&	$-$0.32	&	83.34	&	20	\\
& Grt vs. $Q$ ($H_{R}<6.2$)	&	0.26	&	43.47	&	6	&	0.54	&	91.01	&	11	&	0.40	&	93.34	&	22	\\
& Grt vs. $a$	&	$-$0.08	&	18.68	&	10	&	0.11	&	40.76	&	27	&	0.21	&	81.33	&	42	\\
& Grt vs. $a$ ($H_{R}>6.2$)	&	$-$0.40	&	51.16	&	4	&	$-$0.16	&	46.90	&	16	&	$-$0.09	&	30.59	&	20	\\
& Grt vs. $a$ ($H_{R}<6.2$)	&	0.66	&	85.83	&	6	&	0.61	&	94.59	&	11	&	0.57	&	99.12	&	22	\\
\hline
SDOs & Grt vs. $e$	&	$-$0.32	&	62.96	&	9	&	$-$0.49	&	96.28	&	19	&	$-$0.27	&	81.78	&	25	\\
& Grt vs. $H_{R}$	&	$-$0.52	&	85.61	&	9	&	$-$0.64	&	99.34	&	19	&	$-$0.34	&	90.86	&	25	\\
\hline
Cent & Grt vs. $i$	&		&		&		&	$-$0.31	&	67.16	&	11	&	$-$0.31	&	79.67	&	18	\\
& Grt vs. $e$	&		&		&		&	0.39	&	78.36	&	11	&	0.56	&	98.01	&	18	\\
& Grt vs. $H_{R}$	&		&		&		&	$-$0.51	&	89.26	&	11	&	$-$0.26	&	72.21	&	18	\\
\hline
All & Grt vs. $q$	&	0.13	&	52.26	&	30	&	0.32	&	99.66	&	83	&	0.34	&	99.97	&	116	\\
& Grt vs. $i$	&	$-$0.47	&	98.78	&	30	&	$-$0.48	&	100.00	&	83	&	$-$0.42	&	100.00	&	116	\\
& Grt vs. $e$	&	$-$0.28	&	86.45	&	30	&	$-$0.28	&	98.85	&	83	&	$-$0.27	&	99.68	&	116	\\
& Grt vs. $H_{R}$	&	$-$0.63	&	99.93	&	30	&	$-$0.28	&	98.91	&	83	&	$-$0.17	&	93.72	&	116	\\
\hline
 SDOs+hot & Grt vs. $q$	&	$-$0.03	&	9.48	&	19	&	0.31	&	96.06	&	46	&	0.38	&	99.78	&	66	\\
& Grt vs. $i$	&	$-$0.41	&	91.73	&	19	&	$-$0.37	&	98.75	&	46	&	$-$0.27	&	97.13	&	66	\\
& Grt vs. $H_{R}$	&	$-$0.57	&	98.38	&	19	&	$-$0.40	&	99.21	&	46	&	$-$0.26	&	96.39	&	66	\\
\hline
SDOs+Cent & Grt vs. $H_{R}$	&	$-$0.65	&	94.83	&	10	&	$-$0.48	&	99.02	&	30	&	$-$0.19	&	76.87	&	42	\\
\hline
\end{tabular}}
\medskip
Interesting correlations of the spectral gradient (Grt) versus~$H_{R}$ and orbital parameters discussed in text. The spectral gradient, Grt(\%$/100$~nm), was calculated by fitting over the available color intervals per object. OWN means our own data, OWN+LP means our own data
merged with the ESO Large Program data (Boehnhardt et~al. \cite{Boe02}; Peixinho et~al. \cite{Peix}), OWN+LP+2MS means the OWN+LP data merged with the Meudon Multicolor Survey data (Doressoundiram et~al. \cite{Doress_b}),
$\rho$~= Spearman rank correlation, SL~= Significance level, $n$~= Number of
objects.
\end{table}