chr21 spVCF+bgzip file derived from New York Genome Center's GATK joint variant call set of 1000 Genomes Project deep whole-genome resequencing (N=2,504).
Tweet announcing original data: https://twitter.com/notSoJunkDNA/status/1125401248348495873
Original VCF (18GB): http://ftp.1000genomes.ebi.ac.uk/vol1/ftp/data_collections/1000G_2504_high_coverage/working/20190425_NYGC_GATK/CCDG_13607_B01_GRM_WGS_2019-02-19_chr21.recalibrated_variants.vcf.gz
Squeezed & encoded through spVCF v1.0.0: https://github.com/mlin/spVCF