Spectrum of the average surface brightness inside −65° < ℓ < 65° and −1° < b < 1° for the initial model (left) and the final modified model (right). The thick colored solid lines represent different components of the model: supergiants (purple), AGB stars (blue), giants (teal), main sequence stars (green), other stellar types (dark gray), dust emission from PAHs (red), VSGs (orange), and big dust grains (yellow), and scattered light (black). The major components are labeled in the left panel. The shaded gray area shows the total flux. The open black circles show the model fluxes after convolution with the transmission curves, and the filled black circles show the observations.