ZTF SN Ia DR2: Improved SN Ia colors through expanded dimensionality with SALT3+ W. D. Kenworthy, A. Goobar, D. O. Jones, J. Johansson, S. Thorp, R. Kessler, U. Burgaz, S. Dhawan, G. Dimitriadis, L. Galbany et al. (17 more) A&A, 697 (2025) A125 Published online: 12 May 2025 DOI: 10.1051/0004-6361/202452578