请问下载下来的1000万位点的数据，有没有格式相关文档呢？

# For each SNP or short InDel, we provide its identifier (an
# rsid base on dbsnp 150 or an internal id), its location on 
# the reference human genome (human assembly build 37, GRCh37)
# and the genotype call oriented with respect to the plus 
# strand on the human reference sequence. 
#
# Please note, as our ability to impute genotypes improves, it is
# possible that your data may be different at different times.
#
# rsid chromosome position genotype
rs529040510 1 48180 GG
rs540123730 1 138802 TT