[R] how to plot empirical distribution function?

[kiotoqq]

I have the table
company: 1 2 3 4 5 6 7 8 9 10 11
transaction volume:120 40 75 85 55 75 55 90 90 55 155

how can I plot the empirical distribution function of it? I only know there
is the ecdf, but I dont know how to use it, please help!
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