Table 3: Definition of the pseudo-equivalent width indices for the H $\delta$ (H $\delta _{\rm A}$ in Worthey $\&$ Ottavianni 1997) and for the two high order Balmer absorption lines. For the two last lines, we followed the same principle as for Lick indices while using windows defined Bica $\&$ Alloin (1986).
Name Blue and red bandpasses (Å) Index continua (Å)

H $\delta _{\rm A}$ 4041.60-4079.75 4128.50-4161.00 4083.50-4122.25

H9 3810-3820 3855-3865 3825-3845

H8 3855-3865 3905-3915 3870-3900

**Table 3:** Definition of the pseudo-equivalent width indices for the H $\delta$ (H $\delta _{\rm A}$ in Worthey $\&$ Ottavianni 1997) and for the two high order Balmer absorption lines. For the two last lines, we followed the same principle as for Lick indices while using windows defined Bica $\&$ Alloin (1986).
Name	Blue and red bandpasses (Å)	Index continua (Å)
H $\delta _{\rm A}$	4041.60-4079.75 4128.50-4161.00	4083.50-4122.25
H9	3810-3820 3855-3865	3825-3845
H8	3855-3865 3905-3915	3870-3900

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