code: def get_hcurves_and_means(dstore):
      
      rlzs_assoc = dstore['csm_info'].get_rlzs_assoc()
      getter = getters.PmapGetter(dstore, rlzs_assoc)
      pmaps = getter.get_pmaps()
      return dict(zip(getter.rlzs, pmaps)), dstore['hcurves/mean']
docs: Extract hcurves from the datastore and compute their means.
  
      :returns: curves_by_rlz, mean_curves