Figure 3.

(a) Different types of influences (top row, blue line) that can confound SIF retrievals: uniform (left column), and non-uniform sloped (center column) and random (right column). Each of these influences is applied (middle row) to a sample of simulated FIREFLY spectra (black line), resulting in an adjusted spectrum (blue line). Valleys for indirect SIF retrieval (red x) are shown for seven absorption features. The resulting error in the SIF retrieval (bottom row) is shown for direct retrievals from every band (green line), and indirect retrievals from the absorption features (red x). (b) One absorption feature (identified by the red boxes in (a)) is simulated over a range of proportional depths to show the reaction of indirect SIF retrievals to uniform (left), sloped (middle), and random (right) influences.