How to access to the string inside a string variable in a :e command

Hello,
A beginner's question.
I create the string variable foobar using
let foobar = "test2.f"

Using
echo foobar
results in test2.f (OK)
Now I want to open test2.f
:e foobar
opens a file foobar
:e 'foobar'
opens the file 'foobar'
What is the syntax to open test2.f using the foobar variable.

Best regards

Jean Johner

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