code: def raw_data():
      """Get some starting data."""
      # raw with ECG channel
      raw = read_raw_fif(raw_fname).crop(0.0, 5.0).load_data()
      data_picks = pick_types(raw.info, meg=True, eeg=True)
      other_picks = pick_types(raw.info, meg=False, stim=True, eog=True)
      picks = np.sort(np.concatenate((data_picks[::16], other_picks)))
      raw = raw.pick([raw.ch_names[p] for p in picks])
      raw.info.normalize_proj()
      ecg = RawArray(
          np.zeros((1, len(raw.times))),
          create_info(["ECG 063"], raw.info["sfreq"], "ecg"),
      )
      with ecg.info._unlock():
          for key in ("dev_head_t", "highpass", "lowpass", "dig"):
              ecg.info[key] = raw.info[key]
      raw.add_channels([ecg])
  
      src = read_source_spaces(src_fname)
      trans = read_trans(trans_fname)
      sphere = make_sphere_model("auto", "auto", raw.info)
      stc = _make_stc(raw, src)
      return raw, src, stc, trans, sphere
  
imports: from copy import deepcopy
  from pathlib import Path
  import numpy
  import pytest
  from numpy.testing import assert_allclose, assert_array_equal
  from mne import Epochs, SourceEstimate, VolSourceEstimate, convert_forward_solution, create_info, find_events, fit_dipole, make_ad_hoc_cov, make_bem_solution, make_forward_solution, make_sphere_model, pick_types, read_bem_solution, read_cov, read_source_spaces, read_trans, setup_source_space, setup_volume_source_space, transform_surface_to
  from mne._fiff.constants import FIFF
  from mne.bem import _surfaces_to_bem
  from mne.chpi import compute_chpi_amplitudes, compute_chpi_locs, compute_head_pos, get_chpi_info, read_head_pos
  from mne.datasets import testing
  from mne.io import RawArray, read_raw_fif
  from mne.label import Label
  from mne.simulation import add_chpi, add_ecg, add_eog, add_noise, simulate_raw, simulate_sparse_stc
  from mne.simulation.source import SourceSimulator
  from mne.source_space._source_space import _compare_source_spaces
  from mne.surface import _get_ico_surface
  from mne.tests.test_chpi import _assert_quats
  from mne.utils import catch_logging
label_desc: Use image node_id 4 for calling a global function with example usage: raw_data() and returns: raw,  src,  stc,  trans,  sphere