Properties of stars analysed in this study in each of the three pointing directions. Top: distribution of the J magnitudes of the spectroscopic sample normalised to the total number of targets. Bottom: distribution of the J magnitudes of our spectroscopic targets given in percentage of the overall population in the corresponding CoRoT/exoplanet field. The red dotted-dashed represents LRa01 stars, the blue solid line stands for LRc01 stars, and SRc01 is shown with a long-dashed green line.