In a chart that displays lines (Line type or X-Y type), you can choose to connect the points with steps instead of straight lines. Some options control the properties of those steps.
In the Chart Type dialogue box of a Line chart or X-Y chart that displays lines, choose Stepped in the Lines type drop-down, then click the Properties button.
Start with horizontal line and step up vertically at the end.
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Start to step up vertically and end with horizontal line.
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Start with horizontal line, step up vertically in the middle of the X values and end with horizontal line.
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Start to step up vertically to the middle of the y-values, draw a horizontal line and finish by stepping vertically to the end.