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$\begin{figure} \par\includegraphics[width=13cm,clip]{7412fig1.eps} \end{figure}$ Figure 1: The upper panel is a P- $\dot{P}$ diagram with SGRs/AXPs and XDINSs plotted. The solid curve is a plot of Eq. (26) with a burst energy of $E_{\rm b}= 10^{46}$ erg, $\alpha = 2$ , and $R_{\rm m}= 20$ km. Also shown are curves for $R_{\rm m}=100$ km, $\alpha = 2$ and energies $E_{\rm b}= 10^{44}$ erg s^-1 (dotted) and $E_{\rm b}= 10^{41}$ erg s^-1 (dashed). These line of constant energy move leftwards as an object ages. In the lower panel luminosity is plotted against period derivative according to Eq. (30). The upper and lower solid lines represent a magnetic to X-ray conversion efficiency, $\eta _{\rm X}$ , of 1 and 0.01 respectively, and the dashed line is the luminosity averaged over all viewing angles (for $\eta _{\rm X}=1$ ). Since $\dot{P}\propto 1/\rm{age}$ , objects further to the left are generally older.
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In the text