Left: mean age (top), total metallicity [M/H] (middle), and [Mg/Fe] abundance ratio (bottom) in the central parts of the F3D ETGs located in the high (red circles) and low-density region (blue circles) of the cluster as a function of the total stellar mass. The red and blue lines in the middle and bottom panels are the least-square fits of the values for the central parts of the ETGs in the high and low-density regions of the cluster, respectively. The error bars in the low-left corner indicate the average uncertainty derived for each quantity. Right: same as in the left panels but for the outskirts of the F3D ETGs. The least-square fitting lines of the left panels are shown as dashed lines for comparison.