Table 1. Data files in the database
| File number | File name | File size (kB) | File type | File description |
| 1 | ndp072.txt | 81 | ASCII text | Documentation file |
| 2 | ndp072.dat | 185 | ASCII text | Data file |
| 3 | ndp072.wk1 | 391 | Binary spreadsheet | Data file |
| 4 | refs.dat | 18 | ASCII text | Reference file |
| 5 | refs.wk1 | 20 | Binary spreadsheet | Reference file |
| 6 | comments.dat | 23 | ASCII text | Comment file |
| 7 | comments.wk1 | 24 | Binary spreadsheet | Comment file |