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Figure 1 – A complex seismic trace consisting of a real part x(t), which is the actual seismic trace,
and an imaginary part y(t), which is a mathematical function calculated from the real part by a
Hilbert transform. When the real and imaginary parts are added in a vector sense, the result is a
helical spiral centered on the seismic time axis (t). This helical trace is the complex seismic trace.