Left: map of G17.64 obtained by averaging the emission over the CH₃CN(12–11) K = 2 line. The contours correspond to the 5σ (outer contour) and 50% level (inner contour) of the continuum emission. The cross marks the position, with errors, of the centimetre continuum source detected by Menten & van der Tak (2004). The synthesized beam is shown in the bottom right. Middle: same as left panel, but for the first moment map. The dashed line indicates the direction of the axis of the ¹²CO outflow detected by Kastner et al. (1994). Right: same as left panel, but for the second moment map.