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This is the dataset of imputed downsampled ancient genomes that we used to assess imputation accuracy of ancient human genomes (for more information, please read our manuscript "Imputation of ancient human genomes"). We downsampled 42 high-coverage ancient genomes (>10x) to coverages 0.1x, 0.25x, 0.5x, 0.75x, 1.0x and 2.0x and we imputed the downsampled data with GLIMPSE v1.1.1 (Rubinacci et al., Nature Genetics (2021)) and using 1000 Genomes as a reference panel.