Core subscription has been the option (closed on an interim basis to additional customers on the SoCalGas system by Resolution G-3304) under which noncore customers have had ability to maintain their noncore status for transportation service priority (and rates), but take procurement service from the two utilities' core gas portfolios. In D.01-12-018 in Investigation (I.) 99-07-003, the Commission terminated core subscription. This issue therefore does not require further discussion in this proceeding.