SEA-LION: Southeast Asian Languages in One Network. - Raymond Ng; Thanh Ngan Nguyen; Yuli Huang; Ngee Chia Tai; Wai Yi Leong; Wei Qi Leong; Xianbin Yong; Jian Gang Ngui; Yosephine Susanto; Nicholas Cheng; Hamsawardhini Rengarajan; Peerat Limkonchotiwat; et al. (CoRR, 2025)