wyckoffs:
- "a"
- "a"
- "e"
- "e"
- "e"
- "e"
- "e"
- "e"
- "e"
- "e"
- "e"
- "e"
- "e"
- "e"
- "e"
- "e"
- "e"
- "e"
- "e"
- "e"
- "e"
- "e"
- "e"
- "e"
- "e"
- "e"