Conventions

Parameters and channels

Physical parameter vectors have order [t0, Deltav, tau]: onset in seconds, velocity kick in m/s, and exponential decay time in seconds. Sampling-coordinate helpers transform kick and decay to log coordinates; use to_sampling and to_physical when crossing that boundary.

clean_signal_f returns an (F, 3) complex array and clean_signal_t an (N, 3) real array. The default channels are A, E, T. Set basis="XYZ" for X, Y, Z. Set tdi=1 or tdi=2 explicitly when matching an external response. Zero-frequency values in the Fourier signal builder are set to zero.

Fourier and noise normalization

Keep the Fourier grid, observation duration, windowing, response, and noise normalization consistent. The notebook noise module describes its continuous Fourier scaling and the conversion to the discrete covariance used by the package likelihood. Inspect notebooks/noise.py and the likelihood API before supplying an external PSD. A taper or cropped observation window must be reflected in the template too.

Arm delays

Equal-arm helpers use a single light travel time. Unequal-arm helpers accept six link delays in order (12, 23, 31, 13, 32, 21), frozen at the glitch epoch. link_ltt obtains these from an orbit object. Frozen delays are an approximation when orbital evolution matters across the response window.

Numerical precision

The package enables JAX float64 on import. Comparisons of independently compiled responses can differ at machine precision, especially where channel combinations cancel. Numerical agreement and passing tests do not establish sampler mixing or scientific recovery for a new dataset.