Reconstruction of spectra using Eq. (4) for subsets of wavelet coefficients. (Left panel - top) Raw spectra for WASP-19 (black) and the flux reconstruction using wavelet coefficients from bands i = 4–12 using the raw spectrum (blue; offset − 0.6) and the best fitting model for WASP-19 (red; offset − 1.2). (Left panel -bottom) The reconstruction of the best-fitting model for WASP-19 (red) and the raw spectrum (blue; offset + 0.5) using coefficients i = 13–17. (Right panel) As in the left panel except with reconstructions using coefficients i = 4–14 (top) and coefficients i = 15–17 (bottom).