Extended Data Fig. 1: MATISSE faint calibrator data and uv coverage.
From: Thermal imaging of dust hiding the black hole in NGC 1068
a,Instrumental squared visibility (ISV) and b, non-calibrated closure phases (T3PHI) of calibrators observed during the months of September 2018, May 2019 and June 2019, at 3.4 μm. Data points are colour-coded by their diameters, and the size of the circles correspond to the average coherence times of the observations. The vertical blue strip covers the approximate correlated flux of NGC 1068 at the same wavelength. Error bars show one standard deviation of data. c, uv coverage of MATISSE observations.
