Description of source "DR21W" from Fish et al. (2011)

Despite the detection of only 5 maser features, DR21W contains the brightest (> 80 Jy) 36 GHz maser in our sample. This maser is the only one for which we detect an antisymmetric Stokes V profile (Figure 3), which will be discussed further in Section 4.1. The bright masers near the origin in Figure 2 are coincident with the 44 GHz masers detected by Kogan & Slysh (1998) to better than a synthesized beamwidth. The velocities of the 36 GHz masers near the origin agree with the velocities of the brightest nearby 44 GHz masers to within 0.2 km s-1 or better.