3D (left) and 2D (right) galaxy overdensity throughout the filament based on the spectroscopic optical data. Left: spectroscopic galaxies and cluster centers are shown as black and yellow large dots respectively. The filament volumes detected with T-REx are shown as blue voxels (with a probability cut at 0.5), while the central spine extracted with COWS is shown with a red line. Right: number of galaxies within 8′ from each pixel is displayed color-coded. The black dots show the X-ray cluster centers. The space between the galaxy clusters (identified as the highest galaxy density peaks) shows a clear overdensity compared to the background.