Like I said, the Houbeis only look big because there are three of them clumped together. You can go to Google Earth to find Houbeis and Song/Yuans, and do direct measurement on meters on them. The Houbeis is around 43m, the Song or Yuan is about 75 meters plus, and in fact, they're even bigger than the Kilos which is around 66 meters, also measurable from Google Earth.