Accepted answer

This second char is a focus chart — it allows user to select and magnify particular part of the main chart. To disable it, just set focusEnable option to false, like this:

nv.addGraph(function () {
    var chart = nv.models.linePlusBarChart()
            top: 30,
            right: 60,
            bottom: 50,
            left: 70
        .x(function (d, i) { return i; })
        .y(function (d, i) { return d[1]; });
        .options({focusEnable: false}); // here it is
    // ...
    return chart;

P.S. Here's live example of you chart that I've used to figure out an answer: with focusEnable option set to false.

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