a) Linewidths, Δv, of the ammonia (1, 1) lines (FWHP) measured toward the core L1251A. b) Mach numbers, Ms, of non-thermal motions at the 54 positions where Tkin was measured directly from the relative population of the (1, 1) and (2, 2) energy levels of NH3. The contours are as in Fig. 3. The (0, 0) map position is as in Fig. 1.
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