Fourier1

https://drive.google.com/file/d/1C9ODUvTFVGqTj4P0gIs4pKul5_ENHiko/view?usp=drive_web
Fourier2

https://drive.google.com/file/d/1u5QqCXmFOAnhV1ztSFzhvdwlSq6TtcBa/view?usp=drive_web