Evolution in the spectral index, size-luminosity, and R_gas(90%)/R_dust(90%) vs. R_dust(90%) spaces of substructured disks evolved with DustPy code with external photoevaporation (F_FUV = 4 G₀). Low viscosity regime (α = 10^−3.5) and disk characteristic radius fixed to r_c = 50 au. Different values of the position of the inserted substructure r_p are explored. The points associated with each trajectory represent the snapshots taken at 0 Myr, 1 Myr, 2 Myr, and 3 Myr, respectively. Top row: M_disk = 0.1 M_star. Bottom row: M_disk = 0.01 M_star.