Kernel global throughput maps of a kernel-nuller at the focus of the four VLTI ATs, observing the ±200 mas FOV surrounding the target HIP 116748 for 1 h. Top panel: throughput map computed with the medium (K0-G2-D0-J3) AT configuration. Bottom panel: throughput map computed with the large (A0-G1-J2-J3) AT configuration. Both maps use the same colour scale, where the transmission is expressed in units of the kernel amplitude collected by one telescope. A white star in each map marks the location of the central star where the rejection by the nuller is optimal.