Deformation timescale as a function of galactocentric radius. Uncertainties arise due to the finite spacing of the snapshots and due to the choice of Z_{ej, thr}. For visibility, markers are slightly shifted around their respective radii R_gal = 2, 4.5 and 8 kpc, with the same shift used for the same SNR, but different explosion model. Typical deformation timescales are on the order of a few percent of the orbital timescale at each radius, slightly shorter than what is expected from deformation by galactic shear alone.