sample names in output vcf file

[ANUBHAB KHAN]

Hi,

I have used strelka for calling germline variants using BAM files without readgroups.

I think because of this the vcf file lists the individuals as SAMPLE1 SAMPLE2 SAMPLE3

Is this the same order in which I declared my BAM files or is there a file created that stores the information on the order of individuals?

Thanks a lot