GTEX Gene Selection

Question

[Bine]

Dear all,

Does anyone know what is exactly meant by "> 6 reads" in below information published on the GTEx website:

"Genes were selected based on expression thresholds of >0.1 TPM in at least 20% of samples and ≥6 reads in at least 20% of samples". https://gtexportal.org/home/documentationPage

I understand what is meant with 0.1 TPM in at least 20% of samples but 6 reads in 20% of samples, I dont quite get the difference between TPM and reads I think.

Thank you, Bine