code: def read_int64(fid):
      """Read 64bit integer from bti file."""
      return _unpack_simple(fid, ">u8", np.int64)
  
imports: import numpy
  from ..._fiff.utils import read_str
label_desc: Use image node_id 12 for calling a global function with example usage: read_int64(fid) and returns: _unpack_simple