Broad-band noises in GX 339-4 during the 2021 outburst observed with Insight-HXMT and NICER Yong-Jie Jin, Xiao Chen, Hai-Fan Zhu, Ze-Jun Jiang and Wei Wang A&A, 697 (2025) A120 Published online: 12 May 2025 DOI: 10.1051/0004-6361/202453494