{
 "id": "LIB2-261",
 "entry_version": 7,
 "class": "RETIRED",
 "title": "Retired independent-channel source doorway",
 "statement": "The earlier source model treated the two channel patterns as independent rather than as the images of one common selector contrast.",
 "scope": {
  "carrier": null,
  "domain": "The earlier independent-channel model in the selector arc, not a universal prohibition on independent sources in other models.",
  "group": null,
  "hypotheses": [],
  "physical_target": null,
  "quantifier": null,
  "real_form": null
 },
 "source_labels_as_printed": {
  "math_status": null,
  "attachment": null,
  "scorecard_tier_word": null,
  "pdf_page": null
 },
 "house_tier": null,
 "review_state": "PUBLISHED",
 "scientific_status": "RETIRED",
 "evidence_status": [
  {
   "kind": "registry",
   "availability": "shipped"
  }
 ],
 "primary_source": {
  "component": "Appendix S",
  "section": "§4, Paired-source replacement",
  "pdf_page": 304,
  "quote": "The correct source model (correcting the retired house doorway, casualty #4) is a single common selector contrast, not independent channel patterns."
 },
 "caution": "The paired-source replacement does not select the common contrast or remove the separate arrow-selection problem.",
 "candidate_ids": [
  "C2-105"
 ],
 "basis": {
  "pdf_sha256_prefix": "b64ddcd9e16a6dcd",
  "release": "Rev33.1_S369"
 },
 "relationships": [],
 "url": "/library-v2/LIB2-261/",
 "content_sha256": "d3fe2d5466c78461c180a2a09f059c0fdad10912dcadc6b64be1cee230c5c749",
 "build_stamp": "BUILD_STAMP S371a · 2026-09-26T22:53Z · master 01d1a5873ede42f5 · cut 9dcc6ce9a8ee3e02"
}