Original NASA/ESA/UK International Ultraviolet Explorer mission data, hosted by STScI/MAST:
SWP36331 NEWSIPS Final Archive MXHI, 1989-05-23; LWP15586, 1989-05-24; LWP04483, 1984-10-02.
MAST public data-use policy: https://archive.stsci.edu/publishing/data-use
NEWSIPS format/noise/frame: https://archive.stsci.edu/iue/manual/newsips/node155.html and https://archive.stsci.edu/iue/faq.html
These are original public mission products, not a third-party copyrighted image collection. Preserve IUE NASA/ESA/UK and STScI/MAST acknowledgments. Exact complete selected file bytes/SHA and source retrieval URLs are in source-members.json.

Brands, Backs, de Koter et al. 2025, X-Shooting ULLYSES XII, A&A697,A54, DOI10.1051/0004-6361/202452784; pinned arXiv2503.14687v1.
https://zenodo.org/records/15044512 ; fixed version1.1.1 (concept15013513); record license CC-BY-4.0.
Two complete machine-readable 24-row parameter tables and original2684-byte readme are supplied. These are published conditional fits. FASTWIND V10.6.0 is proprietary; no software, model archive or observed-spectrum ZIP is included or licensed by this package.

New standalone Python is covered by LICENSE-code.txt. Source data retain their original rights.
NIST magnesium notes quote level wavenumbers35760.848 and35669.298cm^-1; adopted vacuum wavelengths are their inverses (2796.3543/2803.5315Angstrom). https://physics.nist.gov/PhysRefData/Handbook/Tables/magnesiumtable7.htm

Scientific theory references, linked but NOT redistributed:
Lamers, Cerruti-Sola & Perinotto1987, ApJ314,726, §§II–V, Eq4–10and14–19; AAS copyright. https://adsabs.harvard.edu/pdf/1987ApJ...314..726L
Owocki2014 arXiv1409.2084v1, §§2and3.1–3.4; arXiv non-exclusive license. https://arxiv.org/html/1409.2084v1
This prototype is a prescribed pure-resonance Sobolev singlet, not full SEI/comoving transfer, RHD or a reproduced FASTWIND fit.
