/Users/yilu/Documents/teaching/bhc2509/.conda/lib/python3.11/site-packages/requests/__init__.py:86: RequestsDependencyWarning: Unable to find acceptable character detection dependency (chardet or charset_normalizer).
  warnings.warn(
/var/folders/7b/szz3t_z12nb1sfzg8cwh22sh0000gn/T/ipykernel_38118/2203689210.py:108: AltairDeprecationWarning: 
Deprecated since `altair=5.0.0`. Use add_params instead.
  chart = alt.Chart(merged_df).mark_circle().add_selection(