def get_y_units(self):

        dh = pixels_to_EMU(self.drawing.height)
        return (dh * self.height) / self.y_axis.max
calculate one unit for y axis in EMU
dataset/ETHPy150Open cloudera/hue/desktop/core/ext-py/tablib-0.10.0/tablib/packages/openpyxl/chart.py/Chart.get_y_units