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Early results from BOSS include the first detection of the large-scale three-dimensional clustering of the Lyman alpha forest and a strong detection from the Data Release 9 data set of the BAO in the clustering of massive galaxies at an effective redshift z = 0.57. We project that BOSS will yield measurements of the angular diameter distance D_A to an accuracy of 1.0% at redshifts z=0.3 and z=0.57 and measurements of H(z) to 1.8% and 1.7% at the same redshifts. Forecasts for Lyman alpha forest constraints predict a measurement of an overall dilation factor that scales the highly degenerate D_A(z) and H^{-1}(z) parameters to an accuracy of 1.9% at z~2.5 when the survey is complete. Here, we provide an overview of the selection of spectroscopic targets, planning of observations, and analysis of data and data quality of BOSS.","external_url":"https://arxiv.org/abs/1208.0022","cited_by_count":1881,"metadata_source":"pith","metadata_fetched_at":"2026-05-23T22:55:51.615434+00:00","pith_arxiv_id":"1208.0022","created_at":"2026-05-08T20:49:10.999807+00:00","updated_at":"2026-05-23T22:55:51.615434+00:00","title_quality_ok":true,"display_title":"keywords =","render_title":"keywords ="},"hub":{"state":{"work_id":"5fed661b-91ea-46d7-98d4-0fe720688da1","tier":"hub","tier_reason":"10+ Pith inbound or 1,000+ external citations","pith_inbound_count":27,"external_cited_by_count":1881,"distinct_field_count":5,"first_pith_cited_at":"2023-04-11T13:13:14+00:00","last_pith_cited_at":"2026-05-20T17:59:05+00:00","author_build_status":"not_needed","summary_status":"needed","contexts_status":"needed","graph_status":"needed","ask_index_status":"not_needed","reader_status":"not_needed","recognition_status":"not_needed","updated_at":"2026-06-01T16:23:34.850140+00:00","tier_text":"hub"},"tier":"hub","role_counts":[{"context_role":"background","n":6},{"context_role":"dataset","n":1},{"context_role":"method","n":1}],"polarity_counts":[{"context_polarity":"background","n":6},{"context_polarity":"baseline","n":1},{"context_polarity":"use_method","n":1}],"runs":{},"summary":{},"graph":{},"authors":[]}}