Variance componenrs

def getVC(self):
        """
        Variance componenrs
        """
        _Cr = decompose_GxE(self.fr['Cr'])
        RV = {}
        for key in list(_Cr.keys()):
            RV['var_%s' % key] = sp.array([var_CoXX(_Cr[key], self.Xr)])
        RV['var_g'] = sp.array([var_CoXX(self.fr['Cg'], self.XXh)])
        RV['var_n'] = sp.array([var_CoXX(self.fr['Cn'], sp.eye(self.XXh.shape[0]))])
        return RV