Observed visibility amplitudes of SVS 13A, PP 13S, L1551 IRS 5, Haro 5a/6a IRS, V2775 Ori, Z CMa, and Parsamian 21, which were measured using the uvamp task of the Miriad software package. The visibility amplitudes of SVS 13 is partly contributed from the adjacent YSOs and the parent molecular cloud structures. Black curves are observations at ~225 GHz. We combined the data of V2775 Ori taken on October 25 and 26 of 2013; we combined the data of Z CMa taken on October 25 and 26 of 2013, and on March 20 of 2014. Blue curve in the panel of Haro 5a/6a IRS presents the 341 GHz observations taken on March 20, 2014. We scaled the 341 GHz amplitudes to an observational frequency of 225 GHz based on the assumption of spectral index α = 3.0, which corresponds to a scaling factor of 0.286.
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