old_contents: from .core import *
  from .sgr import *
  from .orphan import *
  from .util import *
  from ._gc_hel import _gc_to_hel, _hel_to_gc, _xyz_sph_jac
new_contents: from .core import *
  #from .sgr import *
  #from .orphan import *
  from .util import *
  from ._gc_hel import _gc_to_hel, _hel_to_gc, _xyz_sph_jac
  
subject: comment out coords