Example of the exploratory process to determine possible values for an exponential relaxation timescale. The blue dots corresponds to the χ_red² values of glitch 64, over a subset of the total range of trial τ_d values focused around the timescale that returns the minimum χ_red² (marked by the red line). The dashed orange lines denote the 1σ uncertainty. These rather high χ_red² values are used only to identify a possible timescale. Further analyses are performed for the final measurements (Table 2).