关于对连续二维数据的傅里叶傅里叶级数展开

各位大神，，我从一段非周期连续函数的图像上若干个点（力随时间的变化关系）数据保存于exce中，怎么对数据进行傅里叶级数展开？
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Force_z [newton]
16.12295
-40.6209
-40.4897
-34.5282
-27.1271
-26.7774
-15.9735
-6.66747
-4.46225
3.161115
1.739657
10.71121
21.12073
23.17357
27.74605
23.03363
24.74615
25.14935
22.77048
18.38582
-11.7284
-33.4519
-26.8447
-36.7992
-36.554
-41.3568
-31.8693
-20.1287
-21.3707
-17.1104
-22.6156
-16.6467
-11.4967
-9.81366
-5.29361
-0.65982
3.659556
4.031352
-5.32949
10.9113
-2.99288
9.183011
1.654824
1.53442
2.38717
-9.43544
7.280426
2.233702
-2.93129
5.006448
3.769354
2.259884
5.660908
-2.23066
4.212381
3.127475
4.0998
1.248253
-6.23934
3.401319
-3.2033
8.255448
-0.82393
-4.35242
-1.73038
-3.47415
5.735906
-3.10702
-0.67311
2.288945
0.838939
2.974112
2.008969
-1.81556
-2.44284
-10.8466
3.037117
2.443239
2.365507
4.590033
-0.27275