Table 2: Properties of the cz distribution and significance levels of shape estimators for various subsamples of A3921. ${C}_{\rm BI}$ and ${S}_{\rm BI}$ are the mean velocity and the velocity dispersion of the different distributions (biweight estimators for location and scale, Beers et al. 1990).
Subsample $N_{\rm gal}$ ${C}_{\rm BI}$ ${S}_{\rm BI}$ Skewness AI Kurtosis TI

[km s^-1] [km s^-1] % % % %

Whole sample 104 $\rm 28~047 ^{+76} _{-77}$ $\rm 831 ^{+100} _{-76}$ $\geq$ 10 >20 $\leq$ 10 $\leq$ 1

A3921-A 41 $\rm 28~017 ^{+145} _{-173}$ $\rm 1008 ^{+156} _{-106}$ >10 >20 >20 >20

A3921-B 20 $\rm 27~920 ^{+88} _{-86}$ $\rm 451 ^{+215} _{-80}$ <10 <5 >20 >10

**Table 2:** Properties of the cz distribution and significance levels of shape estimators for various subsamples of A3921. ${C}_{\rm BI}$ and ${S}_{\rm BI}$ are the mean velocity and the velocity dispersion of the different distributions (biweight estimators for location and scale, Beers et al. 1990).
Subsample	$N_{\rm gal}$	${C}_{\rm BI}$	${S}_{\rm BI}$	Skewness	AI	Kurtosis	TI
		[km s^-1]	[km s^-1]	%	%	%	%
Whole sample	104	$\rm 28~047 ^{+76} _{-77}$	$\rm 831 ^{+100} _{-76}$	$\geq$ 10	>20	$\leq$ 10	$\leq$ 1
A3921-A	41	$\rm 28~017 ^{+145} _{-173}$	$\rm 1008 ^{+156} _{-106}$	>10	>20	>20	>20
A3921-B	20	$\rm 27~920 ^{+88} _{-86}$	$\rm 451 ^{+215} _{-80}$	<10	<5	>20	>10

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