<p>PCA values of all vertebral preparation methods for the three skate species <i>Raja brachyura</i>, <i>Raja clavata</i> and <i>Raja montagui.</i></p>

PCA values of all vertebral preparation methods for the three skate species Raja brachyura, Raja clavata and Raja montagui.针对短鳐（Raja brachyura）、棘鳐（Raja clavata）及蒙塔吉鳐（Raja montagui）三种鳐鱼的所有脊椎标本制备方法的主成分分析（Principal Component Analysis，PCA）值。