enotype fileds, which are from the 10th column to the last column per record, it contains the individual level information. Mostly commonly used information are genotype (GT), genotype depth (GD) and genotype quality (GQ). To extract these, specify c(&ldquo;GT&rdquo;, &ldquo;GD&rdquo;, &ldquo;GQ&rdquo;) in the 7th parameter.</p>

<p>The extraction results are stored in <em>result</em> in our example. All values are characters for simplicity. 
The extraction results is a list, and it contains CHROM, ID, AC, 