Pulsar

PolycoEntry(psr, obs, freq, tmid, span, ...)	Entry for polynomial-based pulsar phase prediction.
PhasePredictor([data])	Pulsar phase predictor.
Phase(phase1[, phase2, copy, subok])	Represent two-part phase.
FractionalPhase(angle[, unit, wrap_angle])	Phase without the cycle count, i.e., with a range of 1 cycle.