15N-Relaxation data for phase-separated K4/9/14/18/23/27R-H3-NCP - Hammonds, Erin F.; Singh, Anurag; Suresh, Krishna K.; Yang, Sean; Meidl Zahorodny, Sarah S.; Gupta, Ritika; Potoyan, Davit A.; Banerjee, Priya R.; Morrison, Emma A. (Biological Magnetic Resonance Bank, 2026)