Upper left: $v_{1}$ of positively (red) and negatively (blue) charged hadrons for the 5--40\% centrality interval Upper right: $v_{1}$ of \Dmeson (red) and \Dbar (blue) for the 10--40\% centrality interval. Lower left and right: $\Delta{}v_{1}(h) = v_{1}({h^+}) - v_{1}({h^-})$ and $\Delta{}v_{1}(\rm D) = v_{1}(\Dmeson) - v_{1}(\Dbar)$, respectively Dashed lines represent fits with a linear function