Download

The data on bounds and value updates is available for download in several formats. In some cases, the YAML and JSON files contain more information than the tabular files, such as a description and list of updates for each constant. These are included for convenience, but can also be derived by cross-referencing the information across tabular files.

Data	YAML	JSON	CSV	TSV
Constants All constants with their current bounds or value	constants.yml	constants.json	constants.csv	constants.tsv
Constant groups Metadata about groups of related constants	constant_groups.yml	constant_groups.json	constant_groups.csv	constant_groups.tsv
Updates Bounds updates for constants	updates.yml	updates.json	updates.csv	updates.tsv
Sources Metadata for the primary and secondary sources for bounds updates	sources.yml	sources.json	sources.csv	sources.tsv