Table 8: Difference between the slope of the index- $\sigma$ relation and the expected index variation due to changes in the chemical composition.
Model $\Delta$ CN₂ $\Delta$ Ca4227 $\Delta$ G4300 $\Delta$ Fe4383 $\Delta$ Ca4455 $\Delta$ Fe4531 $\Delta$ C4668 $\Delta$ Fe5015 $\Delta$ Mgb rms

i -0.109 0.046 -0.050 0.013 0.032 -0.003 -0.054 0.014 0.110 0.040

ii -0.148 0.055 -0.068 0.039 0.030 0.004 -0.050 -0.050 0.092 0.045

iii 0.056 -0.016 -0.008 0.022 0.029 -0.003 0.035 0.014 0.098 0.029

iv -0.002 0.029 -0.019 0.031 0.033 -0.002 0.006 0.026 0.006 0.023

**Table 8:** Difference between the slope of the index- $\sigma$ relation and the expected index variation due to changes in the chemical composition.
Model	$\Delta$ CN₂	$\Delta$ Ca4227	$\Delta$ G4300	$\Delta$ Fe4383	$\Delta$ Ca4455	$\Delta$ Fe4531	$\Delta$ C4668	$\Delta$ Fe5015	$\Delta$ Mgb	rms
i	-0.109	0.046	-0.050	0.013	0.032	-0.003	-0.054	0.014	0.110	0.040
ii	-0.148	0.055	-0.068	0.039	0.030	0.004	-0.050	-0.050	0.092	0.045
iii	0.056	-0.016	-0.008	0.022	0.029	-0.003	0.035	0.014	0.098	0.029
iv	-0.002	0.029	-0.019	0.031	0.033	-0.002	0.006	0.026	0.006	0.023

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