| Designation of sample | Diameters of pores in microns | Frequencies of Diameter Equiv. % |
| Sample 2080 | 5 -- 10 | 4 |
| 10 -- 20 | 18 | |
| 20 -- 30 | 31 | |
| 30 -- 40 | 47 | |
| 40 -- 50 | 0 | |
| Sample 3070 | 5 -- 10 | 36 |
| 10 -- 15 | 40 | |
| 15 -- 20 | 14 | |
| 20 -- 25 | 5 | |
| 25 -- 30 | 3 | |
| 30 -- 35 | 2 | |
| 35 -- 40 | 0 | |
| Sample 4060 | 5 -- 10 | 30 |
| 10 -- 15 | 40 | |
| 15 -- 20 | 17 | |
| 20 -- 25 | 7 | |
| 25 -- 30 | 3 | |
| 30 -- 35 | 3 | |
| 35 -- 40 | 0 | |
| Sample 5050 | 5 -- 10 | 25 |
| 10 -- 15 | 36 | |
| 15 -- 20 | 22 | |
| 20 -- 25 | 9 | |
| 25 -- 30 | 3 | |
| 30 -- 35 | 2 | |
| 35 -- 40 | 2 | |
| 40 -- 45 | 1 | |
| Sample 6040 | 5 -- 15 | 52 |
| 15 -- 25 | 41 | |
| 25 -- 35 | 5 | |
| 35 -- 45 | 1 | |
| 45 -- 55 | 1 | |
| Sample 7030 | 5 -- 10 | 14 |
| 10 -- 15 | 47 | |
| 15 -- 20 | 28 | |
| 20 -- 25 | 5 | |
| 25 -- 30 | 4 | |
| 30 -- 35 | 2 | |
| 35 -- 40 | 0 | |
| 40 -- 45 | 0 | |
| Sample 8020 | 5 -- 15 | 63 |
| 15 -- 25 | 25 | |
| 25 -- 35 | 8 | |
| 35 -- 45 | 4 | |
| 45 -- 55 | 0 |