EFS pricing for Lambda function

Can anyone give me any guidance into the EFS pricing for a lambda function?
Before I dive in, I’m curious if I only need to pay for Standard Storage or if I have to add the Throughput costs ontop too, playing around with the calculator is a bit confusing and I’m unsure if Throughput is a must-have or an optional cost. Thanks!!

should just be standard storage, with throughput kicking in ONLY when you enable throughput mode on the elastic file system

Thanks so much - appreciated