Trajectory of the filament eruption projected in 3D space calculated with Eq. (11). The axes (α, β, γ) refer to the local coordinates system determined by the unit vectors (${\widehat{\mathit{e}}}_{\mathrm{\Phi }},{\widehat{\mathit{e}}}_{\mathrm{\Theta }},{\widehat{\mathit{e}}}_n$) (see Fig. 11). γ denotes the local vertical and is perpendicular to the plane formed by α and β (plane tangent to the local solar surface). Panels (a) and (b) show different perspectives of the filament trajectory (color-coded), where the black dashed-lines on the planes α-β depict the top-view trajectory of the filament eruption. The 3D projections reveal that the filament propagates markedly deviated from the local vertical direction. An animation of this figure is available online.