A veneer of calm has settled over Narino, one of the most violent regions of Colombia, where armed groups until recently waged bloody battles for control of vast coca fields. The guerrilla group Segunda Marquetalia has taken control of the southwestern region -- roughly the size of Belgium -- using financial backing from Mexican cartels to unify myriad armed outfits, analysts say. IMAGES AND SOUNDBITES ARRANGED IN SEQUENCES N°36G84NQ