Self-stirring analysis for single-belt debris disc systems. The blue shaded area is the stirring timescale as a function of semi-major axis, according to Krivov & Booth (2018, KB18), while the red shaded area is that derived according to Kenyon & Bromley (2008, KB08). In both cases, the analysis encompasses two representative x_m values of 1(dashed lines) and 10 (solid lines). The red and black points respectively represent the resolved and SED-inferred disc sizes at the estimated stellar age.