I'm sorry, but I need more context and information to accurately categorize the given dataset's spectrum. Are you asking me to perform a Fourier transformation on the dataset or do you want me to categorize it based on some specific criteria? Can you provide more details about the dataset and the desired output?
分类给定数据集的频谱。 
输入：[2, 3, 4, 9, 15, 22, 25, 31, 33]