{"id": "c221", "title": "C221 — The retained 598–52–598 source rectangle", "filename": "490d_C221_529_Mirror_Bounded_Step_20260923.md", "role": "Research action", "step": 221, "sha256": "191fb92d756464d098683f3214444f007709d7cbc8bf07cbff5883c3ec1502b8", "bytes": 1928, "origins": ["C01–C479/reference/490d_C01_C265_Complete_Window_Archive_20260923.zip!/workspace/mirror_C206_C265_529_Expansion_Centers_20260923/C221/490d_C221_529_Mirror_Bounded_Step_20260923.md"], "download": "/sources/191fb92d756464d098683f3214444f007709d7cbc8bf07cbff5883c3ec1502b8.md", "format": "md", "derived": false, "tags": ["Regular", "Mirror / 529"], "excerpt": "C221 — The retained 598–52–598 source rectangle\n\n23 September 2026 · Step 16 of 60, continuing C205.\n\nC06’s source rectangle partitions Flood→SP Noah into 598+52+598, with two overlapping 650 spans.\n\n| Chain | MT Flood | MT Noah | SP Flood | SP Noah |\n|---|---|---|---|---|\n| 3 | 2458 | 3056 | 3108 | 3706 |\n| 5 | 2460 |", "content": "# C221 — The retained 598–52–598 source rectangle\n\n23 September 2026 · Step 16 of 60, continuing C205.\n\nC06’s source rectangle partitions Flood→SP Noah into 598+52+598, with two overlapping 650 spans.\n\n| Chain | MT Flood | MT Noah | SP Flood | SP Noah |\n|---|---|---|---|---|\n| 3 | 2458 | 3056 | 3108 | 3706 |\n| 5 | 2460 | 3058 | 3110 | 3708 |\n\nThis structure is retained rather than rediscovered. It explains why the two successive gains 598 and 650 coexist with another sourced 650 comparison. The overlapping segments do not constitute three independent expansion stages. Their chronological roles and Gear selections remain those of the original regular Noah/Flood construction.\n\n## Evidence and scope\n\nK=529 and r=25/23. BC base B means (B+1)t/Bn BC; reflected AD base A means AD At/(A+1)n. Their civil span is B+A in both seasonal components, with no year zero. Signed paired centers are −B and +A; the center model uses components ±1/4 and restores this separation after dilation. An interval center is geometry, not an event or a proposed universal Mirror axis.\n\nRegular Gears are restricted to Noah/Shem/Flood. Creation and Conquest retain fixed source-field members; no fourth Gear is admitted. Generated coordinates, source-field membership and stored graph incidence are distinct. File_18/File_09 and the frozen C127 graph are unchanged. Earlier N01/N03 qualifications, the missing Shem join, closed primers and unestablished original Reports 11–25 remain unchanged. This packet selectively uses prior evidence; it does not rerun completed campaigns. Assertions and alternative placements are not independent historical witness counts.\n\n**6 step-specific checks and 19 frozen-input checks passed.** Exact inputs, results and predecessor hashes are in the accompanying JSON records; calculation code is in the evidence archive. Source dependencies are identified in the body and frozen in `sources/`.\n", "evidenceLinks": [{"id": "d-68301ab760bfbe2e", "title": "File 18"}, {"id": "d-45851004c5864229", "title": "File 09"}]}