# TCGA bam file duplicates (aligned reads) and related last part of TCGA barcode

I am running an analysis on TCGA bam files (GCRh37/hg19) of whole exome sequencing data.

I usually find one bam file for each sample. However, at least one sample has two bam files, in which the last part of the name (before the extension) has the suffix .1 or .2 or .3...

For example, C500.TCGA-BL-A3JM-01A-12D-A21A-08.1.bam and C500.TCGA-BL-A3JM-01A-12D-A21A-08.2.bam.

I didn't find an explanation for this last suffix. Are they duplicates, or.. ? Is there some wiki about the last part of the filename?