Fig. 2.

Bivariate plot of linear residuals from the Gravettian least-squares lines of frontal (Fr) and parietal (Pa) arc versus chord (Ch) (FrArc = 1.170 × FrCh – 1.76, r² = 0.853, n = 22; PaArc = 1.014 × PaCh + 10.27, r² = 0.871, n = 25, respectively). Samples sizes exceed plotted values because isolated frontal and parietal arcs were used to compute the regression lines. Black squares, EEMHs (Cio: Cioclovina 1; M#, Mladeč; Mui: Muierii 1; O2: Oase 2); gray squares, MPMHs and Nazlet Khater 2 (NK); open squares, Gravettians; gray triangles, Neandertals.