Stokes I visibility amplitude as a function of uv distance (in units of kλ). The open squares are the amplitudes of the visibilities channel-averaged and time-averaged every 120s. The black squares are derived averaging these amplitudes of the visibilities in 6 kλ bins for L1448N, L1448-2A, NGC 1333 IRAS4A, IRAS4B, and IRAS16293 and 3 kλ bins for the other sources. For the wide-binary L1448N, SVS13, and IRAS16293, we model and isolate the two sources separately. For IRAS4B, we also isolate and remove NGC 1333 IRAS4B2 from the visibility data.