Tabulated data: the parameters that are not single numbers.
A :class:`Param` covers a scalar. Real hardware also comes with curves --
a valve's Cv against stem position, a pump's head against flow, and above all a
measured pressure drop against mass flow, which is what a cold-flow test
produces and what supersedes every correlation in this package.
Same rules as a scalar: units are declared and converted once, provenance is
mandatory, and interpolation **refuses outside the measured range** rather than
extrapolating. An extrapolated measurement carries a measurement's authority and
a guess's accuracy, which is the worst of both.
Discovered in Phase 03 rather than designed in Phase 02: the need only became
concrete once components had to accept a measured Δp table. It is a small,
additive extension -- :class:`ComponentInstance` grew a ``curves`` field
alongside ``params`` -- and nothing that existed had to change.
1.15.0