Table 2.

Measured size of heterochromatic repeat measurements in five A. thaliana accessions

Accession	Ind.	18S	SE	25S	SE	5S	SE	CEN	SE	Athila	SE
Ta-0	A	0.84	9	0.84	9	0.68	6	0.90	8	1.27	10
Ta-0	A	0.60	12	0.87	12	1.07	5	1.29	4	2.61	11
Ta-0	B	0.79	11	0.70	19	0.62	16	1.27	11	2.61	13
Br-0	A	0.85	6	0.85	6	1.15	10	0.84	7	1.05	13
Br-0	A	1.09	10	1.18	15	1.75	4	1.10	9	1.40	11
Br-0	B	1.04	8	1.13	13	1.71	6	1.67	11	2.12	15
Is-0	A	1.61	12	1.61	12	1.75	7	0.78	5	1.54	11
Is-0	A	1.32	16	1.63	21	1.82	4	0.87	8	2.57	12
Is-0	B	1.38	10	1.50	13	1.40	8	0.95	12	2.17	14
TAMM-2	A	0.59	6	0.59	6	0.89	8	0.76	8	0.92	9
TAMM-2	A	0.71	11	1.02	8	1.15	4	1.60	8	1.40	11
TAMM-2	B	0.77	12	0.90	20	0.84	20	2.21	10	1.65	13
Loh-0	A	1.68	6	1.68	6	2.28	9	0.54	5	1.10	15
Loh-0	A	0.99	9	1.00	8	2.61	4	0.98	9	1.04	12
Loh-0	B	1.04	10	0.90	20	2.82	9	1.26	11	1.10	14

Units are based on the Col standard (Col-0 = 1). Repeats in individual (A) were assayed using both filter array genomic hybridization and qPCR, its sibling (B) was measured with qPCR only. Filter values are presented in regular font, qPCR in bold. In the filter arrays, probes for the 18S and 25S subunits of the 45S rDNA gene were pooled; the same value is presented for each subunit. The number of observations for each value given is 24 for the filter assays and averages 12 for qPCR. Ind.: Individual.

SE: Propagated standard error of the mean, presented as percent of mean value. For measurement and error propagation details see Methods.