GLS tracking locations + time-matched front metrics

All original GLS tracking locations, plus associated 7-day front thermal and chlorophyll-a front metrics (Thermal metrics = thermal front density, Tdens5; thermal front gradient density, Tgdens5; thermal front persistence, Tpfront; distance to closest thermal front (km), Tdist; side of thermal front, Tside; Chlorophyll-a metrics = chl-a front density, Cdens5; chl-a front gradient density, Cgdens5; persistence of chl-a front, Cpfront; distance to closest chl-a front, Cdist; side of chl-a front, Cside).