Maps of L1498, L1512, L1517BC, and L1400K showing positions where the radial velocity differences, ΔV, between the HC3N (2–1) 18.196 GHz line and the NH3 (1, 1) 23.694 GHz line have been measured at the Effelsberg 100-m radio telescope. On each panel the numbers are the mean velocity shifts ΔV (in m s-1) between the corresponding ΔVs and ΔVa values listed in Tables 2–5. The circles show the half-power beam width at 23 GHz, whereas the linear scale is indicated by the horizontal bars. Reference positions are given in Table 1.
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