Comparison of the relative radial velocities between the HC3N (2–1) and NH3 (1, 1) lines measured at the same coordinates in Feb. 2009 (filled circles) and in Jan. 2010 (open circles). The 2009 data are corrected by 4 m s-1 as described in Sect. 1. For L1517B the offset (Δα,Δδ)2010 = (15′′,15′′) corresponds to the offset (Δα,Δδ)2009 = (0′′,0′′). The mean value is depicted for multiple observations at the same coordinate. The error bars show the 1σ uncertainties.
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