code: def add_emission(self, chunksize=2**19, comp_filter=default_compression,
                       overwrite=False, params=dict(), chunkslice='bytes'):
          
          nparams = self.numeric_params
          num_particles = nparams['np']
  
          return self.add_trajectory('emission', shape=(num_particles, 0),
                                     overwrite=overwrite, chunksize=chunksize,
                                     comp_filter=comp_filter,
                                     atom=tables.Float32Atom(),
                                     title='Emission trace of each particle',
                                     params=params)
docs: Add the `emission` array in '/trajectories'.