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We present a stellar population analysis of the nearby, face-on, SA(s)cgalaxy, NGC628, which is part of the PPAK IFS Nearby Galaxies Survey (PINGS).The data cover a field of view of ~6 arcmin in diameter with a sampling of$\sim$2.7 arcsec per spectrum and a wavelength range (3700-7000A). We applyspectral inversion methods to derive 2-dimensional maps of star formationhistories and chemical enrichment. We present maps of the mean (luminosity- andmass-weighted) age and metallicity that reveal the presence of structures suchas a nuclear ring, previously seen in molecular gas. The disk is dominated inmass by an old stellar component at all radii sampled by our data, while thepercentage of young stars increase with radius. The mean stellar age andmetallicity profiles have a two defined regions, an inner one with flattergradients (even slightly positive) and an external ones with a negative,steeper one, separated at $\sim$60 arcsec. This break in the profiles is moreprominent in the old stellar component. The young component shows a metallicitygradient that is very similar to that of the gas, and that is flatter in thewhole disc. The agreement between the metallicity gradient of the young starsand the gas, and the recovery of the measured colours from our derived starformation histories validate the techniques to recover the age-metallicity andthe star formation histories in disc galaxies from integrated spectra. Wespeculate about the possible origin of the break and conclude that the mostlikely scenario is that we are seeing, in the center of NGC 628, a dissolvingbar, as predicted in some numerical simulations.

PPAK Wide field Integral Field Spectroscopy of NGC 628 III. Stellar population properties