Closure phase of the polychromatic model per wavelength compared to observations. The closure phases for the best fitting model by maximum likelihood were calculated for each of the four telescope triplets, at all accessible uv positions for the UTs where NGC 1068 has a minimum altitude of 35°. The average vector PA is the average of the PA for each of the three baselines in the triplet, ensuring the telescopes are in ascending numerical order. For instance, the average PA for U1-U2-U3 is the is average of the PA of the baselines U1-U2, U2-U3, and U1-U3 (not U3-U1). For visualization purposes, we averaged the different BCD positions for the MATISSE data and reordered the GRAVITY closure phase telescope triplets to match the order of the captions. The changes in closure phase sign from reordering were taken into account.