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Explanation

The conceptual model behind SpectraFit-Core: how model composition works as a directed acyclic graph (DAG), the parameter model, and how the solver front-end forms its residual and Jacobian and derives its post-fit statistics. Background, not step-by-step instructions. For how solver="auto" actually routes a graph to VarPro or TRF, and when to override it, see Choosing a Solver.

Read the DAG model
Model composition (DAG IR) Parameter model Solver front-end & post-fit statistics NIST StRD validation