Table 5: Columns 1 and 2: projected virial radii of A3921-A and A3921-B; Cols. 3 and 4: virial mass estimates for A3921-A and A3921-B; Col. 5: mass ratio. Masses are in $10^{14}~ {M}_{\odot}$ units and radiii in h^-1 Mpc units.
$R_{\rm vir}$ (A) $R_{\rm vir}$ (B) $M_{\rm vir}$ (A) $M_{\rm vir}$ (B) $M_{\rm vir}$ (A) / $M_{\rm vir}$ (B)

$0.39\pm0.02$ $0.38\pm0.02$ $\rm 4.3 ^{+1.4} _{-1.0}$ $\rm0.8 ^{+0.7} _{-0.3}$ $\rm 5.2 ^{+4.4} _{-2.5}$

**Table 5:** Columns 1 and 2: projected virial radii of A3921-A and A3921-B; Cols. 3 and 4: virial mass estimates for A3921-A and A3921-B; Col. 5: mass ratio. Masses are in $10^{14}~ {M}_{\odot}$ units and radiii in h^-1 Mpc units.
$R_{\rm vir}$ (A)	$R_{\rm vir}$ (B)	$M_{\rm vir}$ (A)	$M_{\rm vir}$ (B)	$M_{\rm vir}$ (A) / $M_{\rm vir}$ (B)
$0.39\pm0.02$	$0.38\pm0.02$	$\rm 4.3 ^{+1.4} _{-1.0}$	$\rm0.8 ^{+0.7} _{-0.3}$	$\rm 5.2 ^{+4.4} _{-2.5}$

Source LaTeX | All tables | In the text

	1 Introduction
	2 The data
	3 Cluster membership
	4 Colour properties and spatial morphology of A3921
	5 Cluster kinematics
	6 Dynamical study of the system
	7 Spectral properties of the cluster members
	8 Discussion and conclusions
	Appendix A: Red sequence identification
	References