\begin{document}$ D_2^0(1^3P_2) \to D^{\ast 0}(1^3S_1) \gamma $\end{document}, \begin{document}$ D_3^0(1D_3) \to D_2^0(1^3P_2) \gamma $\end{document}, \begin{document}$ D_2^0(2D_2^\prime) \to D_1^{0}(2P_1) \gamma $\end{document}, \begin{document}$ D_3^0(2^3D_3) \to D_2^0(2^3P_2) \gamma $\end{document}, and \begin{document}$ D^{\ast 0}(1^3S_1) \to $\end{document}\begin{document}$ D^0(1^1S_0) \gamma $\end{document} are of the order of \begin{document}$ 10^{-2} $\end{document}, which are sizable to be detected experimentally. Moreover, the branching ratios of some channels, for example, \begin{document}$ D_1^0(1P_1) \to D(1^1S_0)^0 \gamma $\end{document}, \begin{document}$ D^0(3^1S_0) \to D_1^{\prime 0}(2P^\prime_{1}) \gamma $\end{document}, and \begin{document}$ D^0(3^3S_1) \to D_2^0(2^3P_2) \gamma $\end{document}, are estimated to be of the order of \begin{document}$ 10^{-3} $\end{document}, which may be accessible with the accumulation of data in future experiments."> Radiative decays of charmed mesons in a modified relativistic quark model -
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