The transform matrix, W under non-DFT conditions. The DC term shows the beam profile adopted, and the cosine (solid lines) and sine (dotted lines) components of the fringe pattern for each baseline show the deviation from integer number of fringe periods across the detector (with frequencies in the ratio 1.1 ×  {1:2:3}). This is similar (but with the addition of a DC term) to the visibility to pixel matrix introduced by Le Bouquin & Tatulli (2006).