Sizes of all the irregularities selected for all possible combinations of signs for Δν and , including cases in which one of the parameters was not detected (Δν = 0 or , which are plotted as a letter x and crosses, respectively). These results are for N_d = 10 d, and the known Vela glitches in the dataset were measured as for Fig. 2. The straight lines represent detection limits (events in the shaded areas are unlikely to be detected) when considering average noise levels. The curved dotted lines give an indication of the event sizes below which deviations to the timing model will remain under typical noise levels for 10 d since the event epoch (see Sect. 6).