Fig. 7
From: Halysis Høeg, 1932 — an ancestral tabulate coral from the Ordos Basin, North China
The equivalence and the linear correlation for the Dp, Dn, Wp, and Wn values of the Halysis tube. Dp is the diameter of a Halysis tube measured parallel to the chain alignment, and Dn is the diameter of a Halysis tube measured normal to the chain alignment; Wp is the wall thickness of a Halysis tube measured parallel to the chain alignment, and Wn is the wall thickness of a Halysis tube measured normal to the chain alignment