Top: maps of three commonly used spectral line indices: the 4000 Å break strength (D_n4000); the combined equivalent width of the higher-order Balmer absorption lines Hδ_A and Hγ_A(in Å); the Lick index [Mg₂Fe]. Bottom: mean light-weighted age in the r-band, stellar mass-weighted age, and stellar metallicity. These have been measured from comparison of the line indices to stellar population synthesis models.