Gaia and GES clusters in the [Ca/Fe] vs. [M/H] (upper panel) and in the [α/Fe] vs. [M/H] (lower panel) planes. In the background (light blue 2D histogram with rectangular cells), we show the abundances of the field stars observed by GES. In black, we show the thick disc population; in green, the thin disc one; in blue, the high-α discs. The open clusters observed by GES are represented by orange circles and those observed by Gaia by red circles. In both cases the radius of the circles is proportional to the number of members.