Comparison of the stellar metallicities taken from the NASA Exoplanet Archive (NEA) and homogeneously derived in SWET-Cat. The top and bottom panels show the results for the full and main samples, respectively. The brown symbols and curves represent the data for the P^high stars and theskyblue symbols and curves for the P^low stars. The right panels show the CDFs of the metallicities for the P^low and P^high stars.