[Revision History]

2026/02/24 | Ver1.0 |
- Initial dataset was uploaded

2026/07/10 | Ver1.1 |
- Added the file "Syowa202308.csv"

2026/08/21 | Ver1.2 |
- The value of the absorption cross-section was updated from Hearn (1961)
  to CCQM.O3.2019, in accordance with the BIPM recommendation.