Table 1.

Statistics for the sequencing and assembly of four reference genomes

	YH2.0[2]	HX1[6]	NH1.0	GRCh38[1]
Population	Southern Chinese	Southern Chinese	Northern Han Chinese	European
Sequencing methods	HiSeq (fosmid)	PacBio + BioNano	PacBio + 10× Genomics + Bionano	Sanger (BAC + fosmid)
Assembly software	SOAPdenovo	FALCON	CANU + Supernova	NA
Scaffold N50 (Mb)	20.52	21.98	46.63	67.79
Contig N50 (Mb)	0.02	8.33	3.6	56.41
No. of scaffolds	125,643	5367	5574	735
No. of gaps	235,514	10,901	8484	999
PhaseBlock N50 (Mb)	0.48	NA	2.16	NA
Assembly size (bp)	2,911,235,363	2,934,084,193	2,892,287,479	3,209,286,105

Note: NA, not available.