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This paper describes the Third Public Data Release (DR3) of the Calar AltoLegacy Integral Field Area (CALIFA) survey. Science-grade quality data for 667galaxies are made public, including the 200 galaxies of the Second Public DataRelease (DR2). Data were obtained with the integral-field spectrographPMAS/PPak mounted on the 3.5m telescope at the Calar Alto Observatory. Threedifferent spectral setups are available, i) a low-resolution V500 setupcovering the wavelength range 3749-7500 AA (4240-7140 AA unvignetted) with aspectral resolution of 6.0 AA (FWHM), for 646 galaxies, ii) a medium-resolutionV1200 setup covering the wavelength range 3650-4840 AA (3650-4620 AAunvignetted) with a spectral resolution of 2.3 AA (FWHM), for 484 galaxies, andiii) the combination of the cubes from both setups (called COMBO), with aspectral resolution of 6.0 AA and a wavelength range between 3700-7500 AA(3700-7140 AA unvignetted), for 446 galaxies. The Main Sample, selected andobserved according to the CALIFA survey strategy covers a redshift rangebetween 0.005 and 0.03, spans the color-magnitude diagram and probes a widerange of stellar mass, ionization conditions, and morphological types. TheExtension Sample covers several types of galaxies that are rare in the overallgalaxy population and therefore not numerous or absent in the CALIFA MainSample. All the cubes in the data release were processed using the latestpipeline, which includes improved versions of the calibration frames and aneven further improved im- age reconstruction quality. In total, the third datarelease contains 1576 datacubes, including ~1.5 million independent spectra. Itis available at http://califa.caha.es/DR3.

CALIFA, the Calar Alto Legacy Integral Field Area survey: IV. Third Public data release