anchor.diff:  RUN pip3 install --no-cache-dir pandeia.engine==$PANDEIA_VERSION
   
   # Extract Pandeia reference data into $HOME/pandeia_wfirst_data
  -ADD pandeia_wfirst_data.tar.gz
   RUN tar xvz pandeia_wfirst_data.tar.gz
   ENV pandeia_refdata $HOME/pandeia_wfirst_data
   
  
positive.code: 
  WORKDIR $HOME
  USER $NB_USER
  
  # Note: this Dockerfile is ordered roughly by how often things are expected
  # to change (ascending). That way, only the last few changed steps are
  
negative.code: # Prepare files and permissions
  #
  
  # As root, adjust permissions on notebooks
  USER root
  RUN chown -Rv $NB_USER:users $HOME/*.ipynb
  