The majority of SNS zones overlap with at least 5% of their width with a pre-RC zone, a relationship that is also found in topSNSs
| Zone type | SNS | pre-RC |
| Total | 57 | 64 |
| Overlapping | 46 (80.7%) | 43 (67.2%) |
| Nonoverlapping | 11 (19.3%) | 21 (32.8%) |
| Top 30% enriched zones | 17 | 19 |
| Overlapping | 14 (82.4%) | 12 (63.2%) |
| Nonoverlapping | 3 (17.6%) | 7 (36.8%) |
| Zone type | SNS | pre-RC |
| Total | 57 | 64 |
| Overlapping | 46 (80.7%) | 43 (67.2%) |
| Nonoverlapping | 11 (19.3%) | 21 (32.8%) |
| Top 30% enriched zones | 17 | 19 |
| Overlapping | 14 (82.4%) | 12 (63.2%) |
| Nonoverlapping | 3 (17.6%) | 7 (36.8%) |