γ-ray counterpart localizations together with the positions of the radio counterparts of the three candidate sources. Crosses mark the radio positions of 3C   345, NRAO   512 and B3   1640 + 396. The large dotted orange circle denotes the 95% confidence error localization of EGR J1642+3940 (Casandjian & Grenier 2008). The dashed blue ellipse denotes the 95% confidence error localization of 1FGL J1642.5+3947 (Abdo et al. 2010a). The two solid green ellipses denote the 95% confidence error localization of 3C   345 and NRAO   512 presented in this paper. The confusing source Mrk   501 is 2.5° east (left) and 4C +38.41 is 2.1° southwest of the field center.