Ratio of the average prompt $\Dzero$, $\Dplus$, and $\Dstar$ meson $v_2$ coefficients measured in the small-$q_2$ (left panels) and large-$q_2$ (right panels) selected samples with respect to that of the unbiased sample as a function of $\pt$ in $\PbPb$ collisions at $\sqrtsNN=5.02 \TeV$ for the 0--10\% (top panels) and 30--50\% (bottom panels) centrality classes, compared to model calculations .