Here is a list of all modules:
 Spherical Harmonic transform functions. | All these function perform a global spherical harmonic transform |
| Initialization functions. | |
| Fortran API. | Call from fortran without the trailing '_' |
| Rotation of SH fields. | Rotation around axis other than Z should be considered of beta quality (they have been tested but may still contain bugs) |
| Special operators | Apply special operators in spectral space: multiplication by cos(theta), sin(theta).d/dtheta |
 Local and partial evaluation of SH fields. | These do only require a call to shtns_create, but not to shtns_set_grid |
