Time-distance diagrams at log τ = −2 for the simulations containing waves driven by a single source located at the center of the sunspot. Each panel corresponds to a different source depth: z_s = −0.3 Mm (a), z_s = −1.3 Mm (b), z_s = −2.3 Mm (c), z_s = −3.3 Mm (d), z_s = −4.3 Mm (e), and z_s = −5.3 Mm (f). Color lines illustrate the track of the fast-moving waves. Dotted lines in the top right part of all panels show a linear fit of the reflected fast wave. Dashed lines in panels a)−c) show a linear fit of the helioseismic waves. Dashed white boxes delimit the first wavefronts of the fast-moving wave.