In case you are missing the horizontal parts of the graph, you forgot about the last "else 0", so the graph was undefined outsides the spikes. I also changed the function name to i and changed the plot limits to automatic because you seem to use different values than in the pic and the plot didn't show everything. You can change for each axis the first, second and last value. If you simply delete those values Prime will chose values on its own - not always the best choice concerning the scaling steps but at least the plot will show fully.
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