Comparison of simultaneous NIR and sub-mm fluxes for the July 2007 campaign. The graph shows the sub-mm vs. Ks-band (red squares) or L-band (blue crosses) NIR flux. The July 20 night data are marked as filled-in red squares. The NIR fluxes were binned to the sampling of the sub-mm lightcurve (5.6 min). The Ks-band scatterplots shows a significant anticorrelation of r ≈  − 0.5, with p-value p = 6.0 × 10^-6.