Returns the Parameters
        
        Args:
            term_i:     index of the term we are interested in
                        if term_i==None returns the whole vector of parameters

def getScales(self,term_i=None):
        """
        Returns the Parameters
        
        Args:
            term_i:     index of the term we are interested in
                        if term_i==None returns the whole vector of parameters
        """
        if term_i==None:
            RV = self.vd.getScales()
        else:
            assert term_i<self.n_terms, 'Term index non valid'
            RV = self.vd.getScales(term_i)
        return RV