Meaning of 'x->a' in plotting

New to Julia
1

This is from some script:

plot!(x->se.mean, df.steps[steps_equilibrate+1:end], ribbon=se.err, label="shift mean")

What does the syntax ‘->’ mean here?

2

this defines am anonymous function. it’s the same as if you defined

f(x)=se.mean
plot!(f, df.steps[steps_equilibrate+1:end], ribbon=se.err, label="shift mean")
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