Table 1. Data files in the database
| File number | File name | File size (kB) | File type | File description |
| 1 | ndp073.txt | 85 | ASCII text | Documentation file |
| 2 | ndp073.dat | 223 | ASCII text | Data file |
| 3 | ndp073.wk1 | 507 | Binary spreadsheet | Data file |
| 4 | refs.dat | 24 | ASCII text | Reference file |
| 5 | refs.wk1 | 30 | Binary spreadsheet | Reference file |
| 6 | comments.dat | 21 | ASCII text | Comment file |
| 7 | comments.wk1 | 29 | Binary spreadsheet | Comment file |