Hi Edward, a part of my mail is missing, it seems like I accidentally sent a draft version. Although it's maybe not that important, here is the rest of the final paragraph: „I don't know if inaccurate or inconsistent data would favor such a behavior. We now use selective proton pulses in the R1 and NOE-experiments (like described in [1]), temperature compensation for our R1 pulse programs, single-scan interleaving for all experiments, accurate temperature calibration with d4-methanol and automated and hence reproducable peak picking and fitting routines, and recycle delays of 10s in the HetNOE. The consistency of the data from two fields was well below 8% even when the temperature was (accidentally) off by 1K.“ Regards, Martin [1] Lakomek N-A, Ying J, Bax A (2012) Measurement of 15N relaxation rates in perdeuterated proteins by TROSY-based methods. J Biomol NMR 53: 209–221. doi:10.1007/s10858-012-9626-5. -- Martin Ballaschk AG Schmieder Leibniz-Institut für Molekulare Pharmakologie Robert-Rössle-Str. 10 13125 Berlin ballaschk@xxxxxxxxxxxxx Tel.: +49-30-94793-234/315 Büro: A 1.26 Labor: C 1.10