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In M31 the sodium NaI {\\lambda}8190 index shows a flat equivalent width profile at ~ 0.4 {\\AA} through the majority of the bulge, with a strong gradient up to 0.8 {\\AA} in the central 10\" (38 pc); the Wing-Ford FeH {\\lambda}9916 index is measured to b"},"verification_status":{"content_addressed":true,"pith_receipt":true,"author_attested":false,"weak_author_claims":0,"strong_author_claims":0,"externally_anchored":false,"storage_verified":false,"citation_signatures":0,"replication_records":0,"graph_snapshot":true,"references_resolved":false,"formal_links_present":false},"canonical_record":{"source":{"id":"1506.02654","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2015-06-08T20:00:21Z","cross_cats_sorted":[],"title_canon_sha256":"98c7e65400ae3727e3d4395918c594b27c44240aba2d5be1add1a5edc0adaf37","abstract_canon_sha256":"132c23e6c1762dd9cefba4c33bdd3b5912add61940ea339b44e7659357177243"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:36:52.966645Z","signature_b64":"k+j2Hb4we/X3yH/LMDwCTQ/suchKXgIVdbMk53YyuBMIEMpYGfWRIUoiTIaAmFQxkAXerpnJCQBxZVb62CX0Aw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"1684d0bc08e48c437fb60dc0bac43b6b150dd7482705702c966e7b1e5d264eec","last_reissued_at":"2026-05-18T01:36:52.966105Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:36:52.966105Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"The initial mass functions of M31 and M32 through far red stellar absorption features","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.GA","authors_text":"Niranjan Thatte, Roger L. 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