Left panel: central region of the 3C 129 cluster (∼37′ × 37′) showing the K-band UKIDSS image. The VLA 1424 MHz contours of the radio sources (NVSS; Condon et al. 1998) are overlaid in black. 3C 129 is the head-tailed source with a curved tail on the right and the wide-angle tailed radio source on the left is 3C 129.1. The X-ray 0.1–2.4 keV emission from ROSAT is overlaid in magenta. Right panel: an Aitoff Galactic projection of the galaxy distribution extracted from the 2MASS Galaxy Catalog (XSCz) in the Local Universe shown from the northern hemisphere (Jarrett 2004). The image highlights the large filamentary structure of the PPS shaded in pink. The 3C 129 cluster lies in the GP crossing at ℓ ≈ 161°.