Hello, STAR output reads per gene gives 4 columns, they are:
- Gene ID
- Counts for unstranded RNA-seq
- Counts for the 1st read strand aligned with RNA
- Counts for the 2nd read strand aligned with RNA
I found the details here,
Reference-based RNA-Seq data analysis
go to part Counting the number …, on the Hands-on: Choose Your Own Tutorial, choose STAR