Relationships of the normalized water index 3 (NWI-3) with leaf water potential (ψ_leaf), soil water potential (ψ_soil), leaf relative water content (RWC), canopy temperature (CT), and available volumetric soil water (AVSW) by combining determinations across environments for a subset of sister lines (SBS-I and SBS-II), advanced lines (ALN), and synthetic lines (SYNDER).