Table 5: Cluster structural parameters for NGC 6218.
Parameter Fitted Literature Ref.
  value value  
Core radius $r_{\rm c}$ $0\hbox{$.\mkern-4mu^\prime$ }6$ $0\hbox{$.\mkern-4mu^\prime$ }7$ a
Tidal radius $r_{\rm t}$ $17\hbox{$.\mkern-4mu^\prime$ }6$ $20\hbox{$.\mkern-4mu^\prime$ }4$ a
Half-mass radius $r_{\rm h}$ $3\hbox{$.\mkern-4mu^\prime$ }0$ $2\hbox{$.\mkern-4mu^\prime$ }2$ a
Central vel. disp. $\sigma_{\rm v}$ 4.5 km s-1 4.0 km s-1 b
$\textstyle \parbox{7.5cm}{ $a$ : Harris (1996).\\ $b$ : Pryor \& Meylan (\cite{Pryor1993}).}$

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