This read-only object holds the imaginary component of a complex-valued data sample captured in a snapshot, complementing p2mpRealPart to form a complete complex number for that sample. It exists because, per the desc, this particular attribute's data is inherently represented as a complex value rather than a simple scalar. For example, when diagnosing signal-quality issues that depend on phase relationships, an engineer would combine each p2mpImaginaryPart with its matching p2mpRealPart to compute the magnitude and phase of the sampled signal.