Variance componenrs

def getVC(self):
        """
        Variance componenrs
        """
        _Cr = decompose_GxE(self.full['Cr'])
        RV = {}
        for key in list(_Cr.keys()):
            RV['var_%s' % key] = sp.array([var_CoXX(_Cr[key], self.Xr)])
        RV['var_c'] = self.full['var_c'] 
        RV['var_n'] = self.full['var_n'] 
        return RV