Schematic sketch of our mock filament and cluster setup. The background whisker plot shows the shear fields of the filament (red) and the NFW halo (blue). Note that the length of the filament whiskers is enhanced by a factor of 15 with respect to the halo ones for clarity. The global coordinate system θ, the filament’s orientation θ_f, and the distance from the filament center along an axis perpendicular to its extension h are also clearly marked. The 3D orientation of the coordinate frame is right-handed. In our analysis we treat the two sides of the filament as independent so that we can access all possible geometrical configurations. The figure shows the most simple configuration however, which is an identical orientation angle for the two sides of the filament with respect to the main halo.