Table 6: Gas and total mass determination from X-ray data. Column (1): cluster name; Cols. (2, 3): gas and total mass calculated by means of the $\beta $-model; Cols. (4, 5): gas and total mass calculated by means of the Sérsic model; Col. (6): gas fraction ( $M_{\rm {gas}}/M_{\rm {tot}}$) calculated by means of the best model. Values in bold represent the best model for the cluster.
  $\beta $-model Sérsic  
Cluster $M_{\rm gas}$ ( $10^{14} ~M_{\odot}$) $M_{\rm tot}$ ( $10^{14} ~M_{\odot}$) $M_{\rm gas}$( $10^{14} ~M_{\odot}$) $M_{\rm tot}$( $10^{14} ~M_{\odot}$) $f_{\rm gas}$
  (<r500) (<r500) (<r500) (<r500) (<r500)
A496 1.074 $\pm$ 0.040 1.997 $\pm$ 0.012 0.330 $\pm$ 0.040 3.270 $\pm$ 0.19 0.10 $\pm$ 0.014
A1689 3.79 $\pm$ 0.17 10.87 $\pm$ 0.20 1.672 $\pm$ 0.080 11.14 $\pm$ 0.46 0.150 $\pm$ 0.010
A2050 0.568 $\pm$ 0.079 4.974 $\pm$ 0.094 - - 0.114 $\pm$ 0.016
A2631 0.84 $\pm$ 0.16 11.78 $\pm$ 0.58 - - 0.072 $\pm$ 0.014
A2667 1.789 $\pm$ 0.047 7.06 $\pm$ 0.14 1.132 $\pm$ 0.066 11.63 $\pm$ 0.24 0.0973 $\pm$ 0.0060


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