Unveiling Fine-Grained Visual Traces: Evaluating Multimodal Interleaved Reasoning Chains in Multimodal STEM Tasks. - Jing Jin; Hao Liu; Yan Bai; Yihang Lou; Zhenke Wang; Tianrun Yuan; Juntong Chen; Yongkang Zhu; Fanhu Zeng; Xuanyu Zhu; Yige Xu 001 (CoRR, 2026)