Make a dictionary with SASA assigned to each ligand atom, stored as list of SASA values over
		the simulation time.

def assign_per_atom_sasa(self):
		"""Make a dictionary with SASA assigned to each ligand atom, stored as list of SASA values over
		the simulation time."""
		atom_names= [atom.name for atom in self.topology_data.universe.ligand_noH.atoms]
		sasa_dict = {}
		for atom in range(0,self.topology_data.universe.ligand_noH.n_atoms):
			sasa_dict[atom_names[atom]]=[self.sasa[i][atom] for i in range(len(self.sasa))]
		return sasa_dict