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Fig. 1.

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Sketch of FVG. Observations in filters i and j measured at three different time instances (right). By pairing flux values of co-occurring observations, we form points in the flux-flux plot that fall on a line (dashed). Vector gij (in brown) corresponds to the unobserved host-galaxy and defines a line gij ⋅ x that intersects the dashed line at x0, the point of (unobserved) minimum AGN activity. The FVG method consists of finding the intersection of u ⋅ x and the dashed line; u (in green) is a vector that has the same direction (i.e., same colors) as gij and therefore also intersects the dashed line at x0.

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