Table 3: 1-D statistical tests performed in the ROSTAT package that exclude the hypothesis of a single Gaussian distribution for the different velocity datasets considered in the paper. In Cols. 1 and 2 we report the name and the value of the statistics, while Col. 3 indicates their significance levels.
Whole cluster

Statistical test Value Significance

A 0.735 <1%

B2 3.567 8.8%

I 1.099 <5%

KS 0.901 5.0%

V 1.621 2.5 %

${\rm W}^2$ 0.163 1.6%

${\rm U}^2$ 0.159 1.2%

${\rm A}^2$ 0.907 2.1%

A3921-A

Statistical test Value Significance

none - -

A3921-B

Statistical Test Value Significance

A 0.684 < $5\%$

U 4.822 $\sim$ 1%

B1 -0.657 7.8%

B2 4.738 2.1%

B1 and B2 6.123 4.7%

**Table 3:** 1-D statistical tests performed in the ROSTAT package that exclude the hypothesis of a single Gaussian distribution for the different velocity datasets considered in the paper. In Cols. 1 and 2 we report the name and the value of the statistics, while Col. 3 indicates their significance levels.
	Whole cluster
Statistical test	Value	Significance
A	0.735	<1%
B2	3.567	8.8%
I	1.099	<5%
KS	0.901	5.0%
V	1.621	2.5 %
${\rm W}^2$	0.163	1.6%
${\rm U}^2$	0.159	1.2%
${\rm A}^2$	0.907	2.1%
	A3921-A
Statistical test	Value	Significance
none	-	-
	A3921-B
Statistical Test	Value	Significance
A	0.684	< $5\%$
U	4.822	$\sim$ 1%
B1	-0.657	7.8%
B2	4.738	2.1%
B1 and B2	6.123	4.7%

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