3D reconstruction of the outer shell (red) traced by [OIII] at 5007 Å, and the inner shell (blue) traced by the Hβ emission. Top panel: Projection of the inner and outer shell in the PPP space, together with their respective projections in each of the planes, shown in orange and grey, respectively. Middle panel: Histogram of the radial distance of both shells from the position of the central binary is presented in the middle panel. Bottom panel: Cut of both shells at the angle of the outer shell. The data were rotated and interpolated accordingly to present the structure of both shells. The data indicate a spherical inner shell that extends up to ~3500 AU (dashed cyan line), while the outer shell shows an arc-like geometry that extends from ~7100 up to ~9500 AU (dashed purple lines).