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Caption: Figure 2.
870 μm observations that yielded detections were made during two separate scheduling blocks: 2018 October 18/19 and 2018 October 21. The observations on the first night were done with an eastern array comprising ALMA, APEX, GLT, IRAM30m, and NOEMA. Observations on the second night were made with a western array: ALMA, APEX, GLT, and SMA. The scheduling blocks for both nights are shown along with the one-letter station codes, which are listed in parentheses. All detections are on baselines involving ALMA. The scans that yielded detections on baselines defined by a given station are indicated by the white horizontal ticks centered in each time block: from the top, ticks correspond to XL, XR, YL, and YR mixed polarizations per the legend at upper right. The absence of a tick indicates a nondetection. Three scans at 230 GHz (1.3 mm) were performed at the end of the eastern subarray scheduling block using just the IRAM30m and ALMA facilities.
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