F-15SG Canopy/Fuselage Blisters

Does anyone know what the two large blisters at the side of the F-15SG canopy are for, as seen in the following image: http://www.airliners.net/photo/Singapore—Air/Boeing-F-15SG-Strike/1819926/L/&sid=6867218790a6927928f189514fcafe1b

Thanks