code: def read_uint64(fid):
      """Read unsigned 64bit integer from bti file."""
      return _unpack_simple(fid, ">u8", np.uint64)
  
imports: import numpy
  from ..._fiff.utils import read_str
label_desc: Use image node_id 11 for calling a global function with example usage: read_uint64(fid) and returns: _unpack_simple