Table 3: Light curve fit resultsa.
Model parameters Simple power law Broken power law Smoothly-joined power laws Broken power law+Gaussian
  excluding flare excluding flare excluding flare full data set
$\alpha_1$ $\rm 1.41^{+0.22}_{-0.24}$ $\rm 1.58^{+0.18}_{-0.16}$ $\rm 1.73^{+0.40}_{-0.24}$ $1.58\pm0.17$
$t_{\rm b}$ (s) - $(4.19^{+6.17}_{-0.36})\times 10^{3}$ $(3.61^{+1.36}_{-1.03})\times 10^{3}$ $(4.36^{+6.23}_{-0.53})\times 10^{3}$
$\alpha_2$ - $0.50\pm0.14$ $\rm0.42_{-0.12}^{+0.11}$ $\rm0.50^{+0.13}_{-0.14}$
Gaussian centre (s) - - - $\rm 211.1^{+5.4}_{-4.4}$
Gaussian width (s) - - - $\rm 17.9^{+12.3}_{-4.6}$
$\chi^{2}_{\rm red}$ 4.32 1.20 1.29 1.58
d.o.f. 12 10 10 17
$\textstyle \parbox{16.5cm}{ $^{{a}}$\space We follow the notation $F(t) \propto t^{-\alpha}$ .}$


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