Table 4: Fitted age-velocity dispersion relations.
Parametrization Binned Age $\vert W\vert$ $x_{\rm tot}$ xu xv xw note
  by calibration weight          
$\sigma\propto (1 +t/\tau)^x$ Number RPM98 No $0.27\pm 0.01$ $0.24\pm 0.02$ $0.30\pm 0.03$ $0.34\pm 0.02$  
$\sigma\propto (1 +t/\tau)^x$ Number RPM98 Yes $0.50\pm 0.02$ $0.47\pm 0.02$ $0.57\pm 0.04$ $0.46\pm 0.03$  
$\sigma \propto t^x$ Age RPM98 No $0.42\pm 0.04$ $0.40\pm 0.02$ $0.48\pm 0.04$ $0.41\pm 0.03$  
$\sigma \propto t^x$ Number RPM98 No $0.26\pm 0.03$ $0.23\pm 0.04$ $0.28\pm 0.04$ $0.35\pm 0.06$  
$\sigma \propto t^x$ Number Donahue (1998) No $0.33\pm 0.05$ $0.29\pm 0.05$ $0.39\pm 0.05$ $0.37\pm 0.08$  
$\sigma \propto t^x$ Number Donahue (1998) Yes $0.50\pm 0.08$ $0.36\pm 0.09$ $0.49\pm 0.13$ $0.53\pm 0.07$  
$\sigma = a_0 + a_1 t^x$ Number RPM98 No $0.24\pm 0.04$ $0.23\pm 0.04$ $0.37\pm 0.07$ $0.30\pm 0.09$  
$\sigma \propto t^x$ Age RPM98 Yes $0.24\pm 0.06$ $0.24\pm 0.07$ $0.19\pm 0.05$ $0.25\pm 0.03$ $p_{\rm II} < 0.75$
$\sigma \propto t^x$ Age RPM98 No $0.24\pm 0.04$ $0.25\pm 0.06$ $0.28\pm 0.04$ $0.25\pm 0.03$ $p_{\rm II} < 0.75$


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