Modulus of the visibility of TWA 5Aa/b observed through the Ks filter in July 2007 and June 2008. The data points show the measurements, and the line in the plot for 2007 is the result of a fit of a binary model to the data. The line in the plot for 2008 does not show a fit to the data but shows the visibility for the position computed from the orbit. The separation predicted at this date is too small to be resolved, which is confirmed by the data.