Table 3: Fits results. Column (1): cluster name; Col. (2): slope parameter of the $\beta$ -model; Cols. (3, 4): scale radius in arcsec and in $h_{\rm 70}^{-1}$ kpc of the $\beta$ -model; Col. (5): electron number density of the central region calculated by means of the $\beta$ -model; Col. (6): slope parameter of the Sérsic fit; Cols. (7, 8) scale radius in arcsec and in $h_{\rm 70}^{-1}$ kpc of the Sérsic model; Col. 9 electron number density of the central region calculated by means of the Sérsic model.
$\beta$ -model Sérsic

Cluster $\beta$ $r_{\rm c}$ $r_{\rm c}$ n₀ $\nu$ $a^{\prime}$ $a^{\prime}$ n₀

(arcsec) ( $h_{\rm 70}^{-1}$ kpc) ${\rm cm}^{-3}$ (arcsec) ( $h_{\rm 70}^{-1}$ kpc) ${\rm cm}^{-3}$

A496 0.410 $\pm$ 0.015 23.48 $\pm$ 0.28 15.48 $\pm$ 0.18 0.084 0.390 $\pm$ 0.046 3.6 $\pm$ 0.23 2.37 $\pm$ 0.15 0.036

A1689 0.550 $\pm$ 0.025 25.72 $\pm$ 0.23 79.16 $\pm$ 0.71 0.065 0.650 $\pm$ 0.030 12.78 $\pm$ 0.16 39.32 $\pm$ 0.48 0.012

A2050 0.43 $\pm$ 0.028 10.22 $\pm$ 0.73 22.0 $\pm$ 1.5 0.026 1.285 $\pm$ 0.047 15.33 $\pm$ 0.32 56.4 $\pm$ 1.2 0.010

A2631 0.732 $\pm$ 0.073 21.2 $\pm$ 2.5 $\pm$ 82.6 $\pm$ 9.6 0.051 1.001 $\pm$ 0.066 14.9 $\pm$ 1.2 58.0 $\pm$ 4.7 0.013

A2667 0.660 $\pm$ 0.017 30.8 $\pm$ 1.9 113.25 $\pm$ 6.99 0.039 0.570 $\pm$ 0.034 6.3 $\pm$ 1.5 23.1 $\pm$ 5.4 0.022

**Table 3:** Fits results. Column (1): cluster name; Col. (2): slope parameter of the $\beta$ -model; Cols. (3, 4): scale radius in arcsec and in $h_{\rm 70}^{-1}$ kpc of the $\beta$ -model; Col. (5): electron number density of the central region calculated by means of the $\beta$ -model; Col. (6): slope parameter of the Sérsic fit; Cols. (7, 8) scale radius in arcsec and in $h_{\rm 70}^{-1}$ kpc of the Sérsic model; Col. 9 electron number density of the central region calculated by means of the Sérsic model.
	$\beta$ -model	Sérsic
Cluster	$\beta$	$r_{\rm c}$	$r_{\rm c}$	n₀	$\nu$	$a^{\prime}$	$a^{\prime}$	n₀
		(arcsec)	( $h_{\rm 70}^{-1}$ kpc)	${\rm cm}^{-3}$		(arcsec)	( $h_{\rm 70}^{-1}$ kpc)	${\rm cm}^{-3}$
A496	0.410 $\pm$ 0.015	23.48 $\pm$ 0.28	15.48 $\pm$ 0.18	0.084	0.390 $\pm$ 0.046	3.6 $\pm$ 0.23	2.37 $\pm$ 0.15	0.036
A1689	0.550 $\pm$ 0.025	25.72 $\pm$ 0.23	79.16 $\pm$ 0.71	0.065	0.650 $\pm$ 0.030	12.78 $\pm$ 0.16	39.32 $\pm$ 0.48	0.012
A2050	0.43 $\pm$ 0.028	10.22 $\pm$ 0.73	22.0 $\pm$ 1.5	0.026	1.285 $\pm$ 0.047	15.33 $\pm$ 0.32	56.4 $\pm$ 1.2	0.010
A2631	0.732 $\pm$ 0.073	21.2 $\pm$ 2.5 $\pm$	82.6 $\pm$ 9.6	0.051	1.001 $\pm$ 0.066	14.9 $\pm$ 1.2	58.0 $\pm$ 4.7	0.013
A2667	0.660 $\pm$ 0.017	30.8 $\pm$ 1.9	113.25 $\pm$ 6.99	0.039	0.570 $\pm$ 0.034	6.3 $\pm$ 1.5	23.1 $\pm$ 5.4	0.022

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