Evolution of the mean tangential velocity (left two panels) and the tangential velocity dispersions (right two panels) for g1+ɡ2 stars and for the ɡ2 separately for the different external potentials and lookback times. The different rows of panels show different orbit families, as labelled. The solid green, red, and blue curves show models in time-variable TNG potential, the FIX potential, and the ISO isolated case, respectively. The different curves show different moments of time for each potential, as labelled.