| Allowed Value | Details | 
|---|---|
| atomblock | block diagonal per atom | 
| diagonal | diagonal elements only | 
| full | full | 
| fullcycle | full with fixed elements per cycle | 
| sparse | selected elements only | 
| userblock | user-defined blocks | 
| Allowed Value | Details | 
|---|---|
| atomblock | block diagonal per atom | 
| diagonal | diagonal elements only | 
| full | full | 
| fullcycle | full with fixed elements per cycle | 
| sparse | selected elements only | 
| userblock | user-defined blocks |