Relative error in NSB calculation with our method (c–d) and the method by Worden et al. (1998a, for two images of subset 6 with the lowest level of inhomogeneities (density images shown on a–b). The facular pattern was derived from the Rome/PSPT observations taken on 21/08/2000 (left) and 09/08/2008 (right). Also given (below the images) are the values of the rms, mean, mean absolute and maximum relative differences within the disc up to 0.98 R. The colour bars apply to the images below them.
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