8799 from the ALMA archive that were made in Band 6 in 2015 January. Details of these observations are described in @booth16. We calibrated the five individual scheduling block executions using the associated `CASA` 4.3.1 reduction scripts. In brief, the correlator setup consisted of four spectral windows with width 2 GHz and channel spacing 16 MHz, centered at 216, 218, 231 and 233 GHz, respectively. The observations included baseline lengths from 15 to 349 meters. The primary beam FWHM size of the 12-meter diameter array antennas of $27\arcsec (\nu/230~{\rm GHz})$ set the useable field of view. We used the `CASA` task [statwt]{} to homogenize the visibility weights among scheduling blocks and note that the execution on 2015 January 03 obtained in the best weather conditions dominates the sensitivity budget. Continuum visibilities were output for analysis after flagging the channels with CO line emission, averaging in time to 30 seconds, and averaging in frequency to 2 GHz bandwidth. Imaging was carried out with the [clean]{} task in [CASA]{} (version 4.7.2).

Very Large Array
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We observed the HR 8799 system with the VLA at 9 mm wavelength in the most compact D configuration. Observations with the 27 array antennas were executed 