29. Select the chart and then, in the Current Selection group on the Format, select Series1 from the drop-down list.
30. Click the Format Selection under the Current Selection group.
31. In the Format Data Series pane, under Series Options, click the Fill & Line icon. Next, turn off the fill by clicking on the No Fill radio button under Fill.
32. Delete the chart title.
33. Select the chart then click the Charts Elements button located on the upper-right corner of the chart. Next, in the expanded menu, check the Secondary Horizontal option under Axes, as per the screenshot below: