The Continuous Wavelet Spectrum (3D Surface) option in the Spectral menu or the Spectral toolbar presents the Continuous Wavelet Transform (CWT) in a full 3D spectral format. The CWT is a multiresolution time-frequency technique that is useful for exploring data known to be non-stationary. It is also of value for determining whether data can be safely judged wide-sense stationary as required by many of the spectral procedures.