Numerically integrated models for TIC 650024463 for the entire 21st century. Upper panel: model ETV curve: red and blue lines represent the primary and secondary curves, respectively, while red circles and blue squares stand for the TESS-observed ETV points. Besides the rapidly oscillating vertical ‘spikes’, which come from the P_out period of 108 d, namely, the so-called medium term third-body perturbations, the 10.9 year third-body forced apsidal motion is also clearly visible. The amplitudes of consecutive half-cycles vary substantially which is the consequence of the octupole-order eccentricity perturbations. Lower left panel: variations of the observable and dynamical arguments of periastron (i.e., the apsidal motion of the triple) until year 2100. Lower right panel: cyclic variations of the inner eccentricity (e_in – red) and the corresponding, similar-period variations of the differences of the dynamical inner and outer arguments of periastrons (${\omega }_{\mathrm{in}}^{\mathrm{dyn}}-{\omega }_{\mathrm{out}}^{\mathrm{dyn}}$ – blue) during the present century. See text for further details.