Chaos map of the TOI-1453 system, with a resolution of 201×201. This map estimates the chaos in a 2D section of the parameter space, along P_c/P_b (x-axis) and e_c (y-axis). The colour code depicts the NAFF chaos estimation, where redder areas are more chaotic. The white regions were unstable before the end of the short-term numerical simulations (escape or close encounter). The actual period ratio of the planet pair constrained from our photometric fit is represented by the vertical line.