The distribution of the relative elementary rate of growth (RERG) in apical domes of various shapes and patterns of displacement lines can be analytically examined. The geometry of these domes may be described by parabolas of n-th order. the variant of the distribution of linear growth rate should be established along any displacement line (e. g. https://www.roneverhart.com/1998-2006-TOYOTA-SIENNA-3-3L-Van-Lower-Engine-Oil-Pan-3MZFE-Engine-6-Cylinder-T/