Radial (blue) and vertical (red) contributions to the mass evolution rate in local Ω_K units as a function of the cylindrical radii, R. A positive (negative) term leads to the formation of local gap (ring). The solid black lines represent the gaps located at R ≃ [6.6, 12.3] while the dashed black lines represent the rings located at R ≃ [9.5, 15]. We use symmetrical log-scale that becomes linear within the interval [5 × 10⁻⁵, −5 × 10⁻⁵].