One-dimensional example of the linear process applied using a matrix in a single step. Input (source coefficients; panel a) and outputs (detector count rates; panel c) in this figure are identical to Fig. 4 but with all of the intermediate operations carried out by a single matrix (panel b). This figure is specifically constructed so that the vertical axis of the matrix is aligned with the source element index, while the horizontal axis is aligned with the detector element index in order to make the matrix nature of the operation visually apparent.