Left: example of modification of the SED due to microlensing. The reference SED of the accretion disc (red) and total SED (AD+torus; thick black) are shown with solid lines. The inset panel shows the source in two different regions of the microlensing map. The star shows the case of a micro-magnification of the AD by μ = 1.84 and the circle shows the case of a micro-demagnification of the AD by μ = 0.57 at 1.1 μm. The panel shows the corresponding SED of the accretion disc component (red) and of the total SED (black). Right: corresponding ratio between the microlensed and the unlensed (total) SED. The bump in the upper curve illustrates the non linear behaviour of microlensing produced by the complex caustic network.