Given the data in Excel you can output a Fourier series and then graph it using the XY Scatter graph. Install the Excel Analysis ToolPak. Launch Excel and click on the "File" tab in the upper-left.

The Theory of Functions of a Real Variable and the Theory of Fourier's Series. By Prof. E. W. Hobson. Vol. 1. Third edition, revised throughout and enlarged. Pp. xv + 736.