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Not understand the value in VCF file

Hi, I am sure if is right to ask the question here. I got the vcf file and need some help to understand the meaning. In the last two columns, there are some rows like:

GT:CNADJ 0|1:2,

I know 0|1 represent hetero, and CNADJ is the copy number of the adjacency but why there is only one number (2) after the : ? I was expecting two numbers like 0|1:2,1.

Also, there are some rows show:

GT:CNADJ 0|1:-1

what does -1 mean here? Thanks very much!

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