Table 1: Fit parameters for a $\beta$ model centred on M1 and M2: S₀ is the central surface brightness, $r_{\rm c}$ is the core radius, and $\beta$ is the slope parameter.
region S₀ in counts s^-1 arcmin^-2 $r_{\rm c}$ in arcmin $\beta$

M2 $8.6 \pm 0.4\times10^{-2}$ $1.11 \pm0.07$ $0.68 \pm 0.03$

M1 $6.8 \pm 0.5\times10^{-2}$ $\rm 1.16^{+0.18}_{-0.15}$ $\rm0.66^{+0.07}_{-0.05}$

**Table 1:** Fit parameters for a $\beta$ model centred on M1 and M2: S₀ is the central surface brightness, $r_{\rm c}$ is the core radius, and $\beta$ is the slope parameter.
region	S₀ in counts s^-1 arcmin^-2	$r_{\rm c}$ in arcmin	$\beta$
M2	$8.6 \pm 0.4\times10^{-2}$	$1.11 \pm0.07$	$0.68 \pm 0.03$
M1	$6.8 \pm 0.5\times10^{-2}$	$\rm 1.16^{+0.18}_{-0.15}$	$\rm0.66^{+0.07}_{-0.05}$

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