Evolution of different properties of the three galaxies over time. Panels a and b illustrate the orbital history of the galaxies, with panel a showing the distance of each galaxy from the center of the forming cluster and panel b the distance between each pair of galaxies. Panels e–g show the evolution of the total mass of each galaxy in different components, dark matter, gas, and stars, respectively. Panel c presents the evolution of the bar mode A₂ in each galaxy, measured within 2r_1/2. Panels d and h show the evolution of the color and SFR in the galaxies. The color coding of the lines in panels c, d and f–h is the same as in panel e. The vertical dashed gray line in all panels indicates the time (t = 4 Gyr, z = 1.6) for which the images of the group are shown in Fig. 1.