Fig. 1
NH3(1,1) and (2,2) spectra measured from the pre- and protostellar cores in Orion B9. The temperature scale is in TMB. NH3(2,2) spectra are offset by –1 K from zero baseline for clarity. Note that there are two velocity components towards SMM 4 and Ori B9 N, and that no lines were detected towards IRAS 05412-0105.
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