Column              Example     Description
------              -------    	-----------
1.  contig          chr10       Chromosome
2.  start           404425      Start position (0-based)
3.  end             404426      End position
4.  ref             G           Reference allele
5.  alt             T           Alternative allele
6.  total_reads     558         Number of total reads over variant in het. samples
7.  ref_reads       196         Number of reads mapped to reference allele
8.  num_hets        6           Number of heterozygous biosamples
9.  allelic_ratio   0.3513      Proportion reads mapping to reference allele
10. bb_test_stat    0.0017      Beta-binomial test statistic
11. adj_p           0.04681     Adjusted p-value
12. dhs             1           Overlapping DHS peak (binary indicator)
13. fps             1           Overlapping consensus footprint (binary indicator)