Table 1: Characteristic values of UD parameters for different UD classes defined in the main text.
Class Condition N $D^{\rm Mean}$ $v^{\rm Mean}$ $I_{\rm Peak}^{\rm Mean}$ $(I_{\rm Peak}/I_{\rm bg})^{\rm Mean}$ T $L_{\rm BD}$ $L_{\rm Traj}$
      [km] [m s-1] [ $I_{\rm ph}$]   [s] [km] [km]
all UDs   12836 229 $\pm$ 68   O.51 $\pm$ O.O9 1.1O $\pm$ O.O8  18O $\pm$ 39O   5O $\pm$ 13O   7O $\pm$ 2OO
all UDs T> 15O s  2899 272 $\pm$ 53 42O $\pm$ 19O O.55 $\pm$ O.1O 1.17 $\pm$ O.1O  63O $\pm$ 63O  19O $\pm$ 22O  29O $\pm$ 35O
peripheral UDs T> 15O s   621 252 $\pm$ 44 45O $\pm$ 21O O.65 $\pm$ O.O7 1.23 $\pm$ O.11  56O $\pm$ 55O  21O $\pm$ 25O  29O $\pm$ 35O
central UDs T> 15O s  2278 278 $\pm$ 53 41O $\pm$ 19O O.53 $\pm$ O.O9 1.15 $\pm$ O.O9  65O $\pm$ 65O  18O $\pm$ 21O  3OO $\pm$ 35O
mobile UDs T> 15O s    85 287 $\pm$ 33 68O $\pm$ 14O O.64 $\pm$ O.O8 1.29 $\pm$ O.O9 227O $\pm$ 83O 1O8O $\pm$ 3OO 147O $\pm$ 41O
stationary UDs T> 15O s  2814 272 $\pm$ 53 41O $\pm$ 19O O.55 $\pm$ O.1O 1.16 $\pm$ O.1O  58O $\pm$ 55O  16O $\pm$ 15O  26O $\pm$ 27O
chain A UDs T> 15O s    48 3O1 $\pm$ 45 48O $\pm$ 19O O.68 $\pm$ O.O6 1.29 $\pm$ O.O8  96O $\pm$ 71O  24O $\pm$ 23O  48O $\pm$ 4OO
light bridge UDs T> 15O s   217 254 $\pm$ 41 43O $\pm$ 19O O.64 $\pm$ O.O8 1.23 $\pm$ O.11  8OO $\pm$ 8OO  22O $\pm$ 24O  37O $\pm$ 43O


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