Table 2.

Mathematical functions used to model growth and their properties

Model	Formula	Description parameters	Remarks
Expo1	PLA=e r×t	r: growth rate	A0=1
Expo2	PLA=A 0×e r×t	A 0: initial size	A 0 is also a magnification factor
		r: growth rate
Gompertz	$\text{PLA}=A_{\max }\times e^{-b\times e^{-r\times t}}$	A max: final rosette size	Limits used for fitting of data: A max=20 000, b=60
		b: position along the time axis
		r: growth rate at inflection point ‘K’