Reference: Z. Arzoumanian et al. "The NANOGrav Nine-year Data Set: Observations, Arrival Time Measurements, and Analysis of 37 Millisecond Pulsars," ApJ, 813, 65 (2015)
Note: See the README file in each version below for details on that version. The 20151208 version has the data used in Arzoumanian et al. 2015 and also includes alternate timing files used in Matthews et al. 2016.