Table 2.

Estimating age of original pith by extrapolation from growth rate between different points on the circumference of Zippori slice (points numbered and dated as in Figure 2).

Radius	Likely age range		Distance	ΔYears	Growth rate	Distance of	Estimated
			between	(according	(cm/year)	point #1	year of pith
			points (cm)	to 14C)		from pith (cm)	formation
	Point #1	Point #3
A	1936–1952	2002–2004	15	50–68	0.2–0.3	11	1900 ± 14
B	1879–1916	2003–2005	13	87–126	0.1	3.5	1868 ± 23
C	1881–1915	2002–2004	14	87–123	0.1–0.2	5	1860 ± 23
	Point #1	Point #2
A	1936–1952	1962–1976	9	10–40	0.2–0.9	11	1913 ± 26
B	1879–1916	1954–1955	7	38–76	0.1–0.2	3.5	1869 ± 28
	Point #2	Point #3
A	1962–1976	2002–2004	6	26–42	0.1–0.2	11	1881 ± 22
B	1954–1955	2003–2005	6	48–51	0.1	3.5	1868 ± 19

The likely age ranges for each point along the radii are taken from Table 1. The distance in centimeters between all possible combinations of points along a radius (1 to 3, 1 to 2 and 2 to 3) is given, followed by the age difference between both points, according to radiocarbon. The next column describes the growth rate ranges which were obtained as a result of dividing the distance measured between points, by either the maximum or the minimum of the radiocarbon measured time range for the ±1σ calibrated range of each point, resulting in two values for the growth rate, given here as a range for the minimum and maximum growth rate. Given the distance of point #1 to the presumed pith, the number of “missing” years to the pith may be calculated according the growth rate, and an estimate for the time range of pith formation may be obtained. It should be noted that the error range for the estimation of time range of pith formation which is due to uncertainty in pith location estimation is negligible in comparison with the uncertainty due to radiocarbon calibration, and is therefore not taken into consideration here.