For atlases in other spaces than the human MNI corresponding normalization templates have to be included in a normalization sub-folder. As an example, for the Px Rat (Groningen) atlas illustrated below many PET templates and MR template are available.
The template files need to be in NifTI format. In the example above they are in compressed Nifti format. They can be accompanied by a simple manifest text file containing
SPECIES = RAT (SPECIES = MOUSE) for mouse atlas templates.