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CODATA Evidence Chain

This folder preserves the pre-2019 CODATA working source and the derived binary forms used by the project.

The canonical corpus currently contains 336 official CODATA 2014 rows parsed from the legacy NIST all-values text file. Project-specific BigCalc2 rows that were appended after the official table, such as Q_UP and Q_DOWN, are not part of this CODATA corpus; those belong in a separate physics-token catalog.

Files

  • pre-2019-codata-2014-raw.txt - raw NIST-style all-values text used as the import source.
  • pre-2019-codata-2014-source.md - named/value/unit source table.
  • pre-2019-codata-2014-binary.md - same row order, with significant digits and binary form.
  • pre-2019-codata-2014-bits-only.txt - one line of bits per source row, no names, no units, no comments.

Conversion Rule

The project's binary conversion uses the published value mantissa only.

376.730 313 461... -> 376730313461 -> binary
6.626 070 040 e-34 -> 6626070040   -> binary
299 792 458        -> 299792458    -> binary

Ignored during conversion:

  • sign
  • decimal point
  • digit-grouping spaces
  • ellipsis
  • uncertainty
  • unit
  • exponent marker such as e-34

That is deliberate. The point is to test the significant-digit information object, not the engineering scale factor.

Rebuild

From the repo root, rebuild generated files from the Markdown source table:

python tools/codata/build_codata_docs.py

To rebuild the full canonical source table and generated artifacts from the checked-in raw text:

python tools/codata/build_codata_docs.py --nist-ascii docs/codata/pre-2019-codata-2014-raw.txt --out-dir docs/codata

Optional official-source fetch step:

python tools/codata/fetch_nist_2014_ascii.py

The fetch step downloads the official NIST 2014 all-values ASCII file into data/codata/raw/. Review that file before replacing docs/codata/pre-2019-codata-2014-raw.txt and rebuilding generated binary files.