Closure phase as a function of time for the 10 largest triangles. The triangles are made of the holes a) 1-5-7, b) 1-2-6, c) 1-6-7, d) 4-5-6, e) 1-2-7, f) 1-5-6, g) 4-5-7, h) 1-4-7, i) 2-5-7 and j) 2-5-6; numbered according to the rows of Table 4–19 in the NaCo manual (available online at eso.org). Calibrator data are represented as circles, while binary star data are squares. The dashed line is the polynomial fit of the calibrator, and the solid line is the closure phase predicted by the best fitting binary system model. The same fit quality is obtained on all 35 closure phases. Overall, the average rms error of the fit is 0.28 degrees.