Bayes factors for the presence of a GW signal in each pulsar’s residuals, from an analysis of the 9 yr data set with ﹩{f}_{\mathrm{gw}}=15\,\mathrm{nHz}﹩. The GW parameters are fixed to the maximum-likelihood values, as determined from a detection analysis. PSR J0613−0200 had the largest Bayes factor for the signal, with ﹩{{ \mathcal B }}_{10}=23.2(5)﹩, indicating that PSR J0613−0200 was the primary source of this signal.