Yuan'ou, and Zheng Ming have calculated the dimensions of the 2,000 liao ship, obtaining a length of , width of , and draught of . Zheng Ming believes that the "Heavenly Princess Classics" depict 2,000 liao ships. André Wegener Sleeswyk extrapolated the size of liao (料 — material) by deducing the data from mid-16th century Chinese river junks. He suggested that the 2,000 liao ships were bao chuan (treasure ship), while the 1,500 liao ships were ma chuan (horse ship). In his calculations, the treasure ships would have had a length of 52.5 m, a width of 9.89 m, and a height of 4.71 m. The horse ships would have a length of 46.63 m, a width of 8.8 m, and a height of 4.19 m. Richard Barker estimated that the treasure ships would have a length of , a width of , and a draught of . He estimated it using an assumed displacement of 3100 tons. One explanation for the colossal size of the 44 zhang treasure ships, if in fact built, was that they were only for a display of imperial power by the emperor and imperial bureaucrats on the Yangtze River when on court business, including when reviewing Zheng He's actual expedition fleet. The Yangtze River, with its calmer waters, may have been navigable for such large but unseaworthy ships. Zheng He would not have had the privilege in rank to command the largest of these ships. Some of the largest ships of Zheng He's fleet were the 6 masted 2000-liao ships. This would give burthen of 500 tons and a displacement tonnage of about 800 tons. Because they were built and based in Nanjing, and repeatedly sailed along the Yangtze river (including in winter, when the water is low), their draught cannot exceed 7–7.5 m. It is also known that Zheng He's fleet visited Palembang in Sumatra, where they needed to cross the Musi river. It is unknown whether Zheng He's ships sailed as far as Palembang, or whether they waited on the shore in the Bangka Strait while the smaller ships sailed at Musi; but at least the draught of the ship that reaches Palembang should not be more than 6 m. Xin Yuan'ou argued that Zheng He's ships could not have been as large as recorded in the History of Ming. based on the following reasons: Ships of the dimensions given in the