**Table 2:** Some of the most important dynamical results derived by Bottke et al. (2002) for bodies coming from the different NEA source regions. The sources studied by these authors were the $\nu _{6}$ and 3:1 resonances, the intermediate source Mars-crossing (IMC) population (namely, Mars-crossers below the $\nu _{6}$ ), the Outer Main Belt (OB) and the Jupiter-family comets. $N_{\rm NEA}$ (H< 18) represents the steady-state number of NEAs with an H magnitude smaller than 18, which is roughly 1 km in size. On the other hand, $\tau$ (Myr^-1) gives the number of bodies injected into the NEA region per million years while $T_{\rm NEA}$ (Myr) is the mean dynamical lifetime spent in the NEA region.
	$\nu _{6}$	IMC	3:1	OB	JFC	Total
$N_{\rm NEA}$ (H< 18)	360 $\pm$ 90	240 $\pm$ 40	220 $\pm$ 90	79 $\pm$ 12	61 $\pm$ 43	960 $\pm$ 120
$\tau$ (Myr^-1)	55 $\pm$ 18	65 $\pm$ 15	100 $\pm$ 50	570 $\pm$ 120	-	790 $\pm$ 200
$T_{\rm NEA}$ (Myr)	6.54	3.75	2.16	0.14	-	-

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