Topic guides

Use these references when choosing a model or checking a calculation’s conventions and limits. Each guide covers a specific topic:

Guide	What to look up
Model contracts	Units, array shapes, parameter mutation and error behavior across backends
Profile conventions	Tracer scale definitions, Sersic deprojection domains and halo cutoffs
Axisymmetric geometry	Coordinates, flattening, inclination and geometry-specific inference constraints
J and D factors	Aperture definitions, finite-cone integrals and cusp restrictions
Numerical accuracy	Quadrature refinement, gradient checks and specialized kernel limits
API migration	Explicit backend names, density cutoffs, precision and sampled-parameter mappings

For setup and executable workflows, follow the tutorials, including JAX and backends, MCMC and diagnostics, and saving and resuming. Theory collects the Jeans and likelihood equations; the API reference documents individual calls.