Normalised closure phase delay window functions for an equilateral 14.6 m triad before (top) and after (bottom) flagging instances with low dynamic range (< 10¹⁰). The colour indicates the corresponding value of the effective visibility, showing that low dynamic range windows tend to be associated with low visibility amplitudes and hence low values of V_eff. The shaded region indicates delays which lay within the horizon limit of the closure phase delay window function plus buffer.