Table 10: Mean differences in the Lick indices at a given $\sigma$ between galaxies in different environments. For each index, we list the mean offset d and its error $\Delta d$ and the t-parameter (of the statistical test $d\ne 0$ ).
Index d $\Delta d$ t

D4000 0.0067 0.0208 0.321

H $\delta_A$ 0.0202 0.0041 4.904

H $\delta_F$ 0.0158 0.0032 4.886

CN₂ -0.0287 0.0062 4.600

Ca4227 -0.0057 0.0034 1.689

G4300 -0.0035 0.0034 1.121

H $\gamma_A$ 0.0061 0.0033 1.843

H $\gamma_F$ 0.0060 0.0042 1.442

Fe4383 -0.0029 0.0022 1.332

Ca4455 -0.0063 0.0020 3.166

Fe4531 -0.0058 0.0015 3.827

C4668 -0.0103 0.0029 3.535

H $\beta$ 0.0006 0.0024 0.259

Fe5015 -0.0053 0.0014 3.776

Mgb 0.0015 0.0029 0.500

Fe5270 -0.0022 0.0010 2.146

Fe5335 0.0014 0.0014 0.993

**Table 10:** Mean differences in the Lick indices at a given $\sigma$ between galaxies in different environments. For each index, we list the mean offset d and its error $\Delta d$ and the t-parameter (of the statistical test $d\ne 0$ ).
Index	d	$\Delta d$	t
D4000	0.0067	0.0208	0.321
H $\delta_A$	0.0202	0.0041	4.904
H $\delta_F$	0.0158	0.0032	4.886
CN₂	-0.0287	0.0062	4.600
Ca4227	-0.0057	0.0034	1.689
G4300	-0.0035	0.0034	1.121
H $\gamma_A$	0.0061	0.0033	1.843
H $\gamma_F$	0.0060	0.0042	1.442
Fe4383	-0.0029	0.0022	1.332
Ca4455	-0.0063	0.0020	3.166
Fe4531	-0.0058	0.0015	3.827
C4668	-0.0103	0.0029	3.535
H $\beta$	0.0006	0.0024	0.259
Fe5015	-0.0053	0.0014	3.776
Mgb	0.0015	0.0029	0.500
Fe5270	-0.0022	0.0010	2.146
Fe5335	0.0014	0.0014	0.993

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