Fig. 19From: Changes and continuity in pottery production and use at Wujiafentou in the core zone of Youziling and Shijiahe cultures in central ChinaBiplot showing chemical variations among the Shijiahe-period red clay cups unearthed from Wujiafentou and Sanfangwan (a biplot of logZr versus logRb, b biplot of logCa versus the ratio of logRb to logZr). Drawn with an 80% confidence ellipseBack to article page