Table 1.

Number of SNPs $N_{\mathit{SNP}}$, heterozygosity H and relatedness R for the eight genomes (autosomes) from the Faroe Islands. $N_{\mathit{SNP}}$, H and R were derived from the KING --bysample and --kinship methods, respectively (Additional files 1 and 5 for our basic and advanced filtering, respectively). We also compare R from kinship with $R_{ROH>x}$ from ROHs (Methods, Additional files 2 and 6 for our basic and advanced filtering, respectively). The median and mean number of $N_{\mathit{SNP}}$, H, R, $R_{ROH>0.1}$ and $R_{ROH>0.2}$ are shown for both filtering criteria used before further processing with PLINK and KING. The $N_{\mathit{SNP}}$, H are shown for the eight individual and merged samples, and R, $R_{ROH>x}$ are shown for the merged samples. For the basic filtering R is like $R_{ROH>0.1}$ and for the advanced filtering R is like $R_{ROH>0.2}$

Parameter	med	iqr	mean	sd	samples
Filter	$\mathit{Q}\mathit{U}\mathit{A}\mathit{L}\mathbf{>}\mathbf{30}$
$N_{\mathit{SNP}}$	3559354	17756	3552025	26065	individual
	1136546	0	1136546	0	merged
H	0.600	0.004	0.597	0.010	individual
	0.292	0.011	0.291	0.007	merged
R	0.515	0.016	0.524	0.042	merged
$R_{ROH>0.1}$	0.517	0.041	0.525	0.031	merged
$R_{ROH>0.2}$	0.475	0.040	0.483	0.031	merged
Filter	PASS,  $\mathit{Q}\mathit{U}\mathit{A}\mathit{L}\mathbf{>}\mathbf{30}\mathbf{,}$ $\mathit{F}\mathit{M}\mathit{T}\mathbf{/}\mathit{D}\mathit{P}\mathit{U}\mathbf{>}\mathbf{10}$
$N_{\mathit{SNP}}$	3243489	15740	3234556	29368	individual
	1002681	0	1002681	0	merged
H	0.607	0.004	0.605	0.010	individual
	0.282	0.011	0.281	0.007	merged
R	0.481	0.017	0.491	0.045	merged
$R_{ROH>0.1}$	0.519	0.043	0.524	0.030	merged
$R_{ROH>0.2}$	0.485	0.044	0.491	0.031	merged