"xifti"s with non-overlapping brain structuresCombine two to three "xifti"s with non-overlapping brain structures into
a single "xifti". The names, intent, and surfaces of the first will be used,
if present. To add more surfaces to the result, use add_surf.
combine_xifti(..., xii_list = NULL, meta = c("first", "all"))The "xifti" objects
Alternatively, a list of "xifti" objects. If specified,
will ignore ...
"first" (default) to just use the metadata from the first
argument, or "all" to include the other metadata in a list.
A "xifti" with data from the inputs
Other functions for manipulating `xifti` objects: 
add_surf(),
apply_xifti(),
convert_to_dlabel(),
merge_xifti(),
newdata_xifti(),
remove_xifti(),
select_xifti(),
transform_xifti()