code: def expected_abs_threshold(threshold):
      """Returns the expected absolute threshold."""
      expected = {"0%": 1.5, "50%": 7.55, "99%": 13}
      return (
          expected[threshold]
          if threshold in expected
          else abs(threshold)
      )
  
imports: import base64
  import os
  import re
  import tempfile
  import numpy
  import pytest
  from nilearn.datasets import fetch_surf_fsaverage
  from nilearn.plotting.js_plotting_utils import add_js_lib, colorscale, decode, encode, get_html_template, mesh_to_plotly, to_color_strings
  from nilearn.surface import load_surf_mesh
label_desc: Use image node_id 5 for calling a global function with example usage: expected_abs_threshold(threshold) and returns: unknown