Figure F2. Location of Site 1243 (Ocean Seismic Network [OSN]-2; star) is shown superimposed on a free-air gravity-anomaly map derived from Geosat and ERS-1 data (courtesy of David Sandwell and Walter Smith). Other sites shown are the Hawaii-2 Observatory (H2O; diamond), where an observatory hole was drilled during Leg 200 (Hole 1224D) (the OSN-1 observatory), where a hole was drilled and cased during Leg 138 (Hole 843B), and the notional site (circle) proposed by International Ocean Network (ION)/OSN documents to fill a coverage gap west of the Galapagos Islands. Hole 1243A replaces the notional site and fills the gap for the region. Additional second priority ION/OSN notional sites lie between Sites H2O and OSN-2.