Coverage and reliability

General complex coverage

Every complex requires at least 80% geometric overlap with its declared window, enough valid pixels, and required line centers inside the configured edge margin. Below this threshold the complete complex is not_covered.

Component-adaptive recipes apply their per-line selection only after the total window passes the threshold. A partial optical-blue fit remains archived, but its QA zoom is shown only when [Ne V] 3427, both [O II] lines, [Ne III] 3870, and Hγ are covered.

Lyα/N V

Lyα has four coverage states:

full

Coverage reaches the required blue and red limits with enough geometric overlap and valid pixels.

red_side_only

The Lyα center and complete 1216–1290 Å red side are usable.

edge_truncated

Useful overlap exists, but the center or complete red side is unsafe.

not_covered

The overlap or valid-pixel count is insufficient.

Full and red-side-only cases are fitted. Edge-truncated and not-covered cases are skipped. After a preliminary fit, contiguous residual runs below \(-3\sigma\) and no wider than 2000 km/s are masked and the complex is refitted once.

lya_fit_reliable is true only for a successful full fit with broad Lyα flux S/N at least three, at most 20% absorption-masked pixels, available covariance, and no active Lyα kinematic bound. Red-side-only measurements are always retained as limited and unreliable.

Host decomposition

Host decomposition is enabled only for finite \(z < 1.2\). Host fractions outside observed rest-frame coverage are not reported as constrained measurements.