[OI] channel maps. The channels cover the velocity range of −330 km s^-1 to 300 km s^-1 relative to the mean redshift of the filament (z = 0.00108, shifted by ~ –220 km s^-1 relative to the central galaxy) with channels of 30 km s^-1. Flux units are 10^-20 erg s^-1 cm^-2 Å^-1. The first 7 channels are covered by a skyline and as such are extremely noisy, therefore no emission is visible. We have retained their panels, but set their value to zero so that the channels are consistent in velocity with the other channel maps.