func chartViewStockClose(with timeFrame: TimeFrame) {
        print("chartViewStockClose called") // Debug

        // generate some sample close values
        var closeVals: [Double] = []

        // steep curve
        closeVals = [10, 16, 12, 15, 14, 13, 11]

        // shallow line
        //closeVals = [10, 11, 12, 13, 14, 15, 16]

        closeVals.forEach { v in
            ArrayStockClose.append(("", v))
        }

        initializeGraph()
    }