Function getCounterAxes

src/plots/cartesian/layout_defaults.js:165–167

(axLetter)

    }

    function getCounterAxes(axLetter) {
        return (axLetter === 'x') ? yIds : xIds;
    }

    function getOverlayableAxes(axLetter, axName) {
        var list = (axLetter === 'x') ? xNames : yNames;