Fig. 11

a Calculated mean noise variance as a function of the total count (dose) in the spectrum-images of the synthetic one-componential object. All spectrum-images were weighted using either the “true”, noise-free mean spectrum (black curve) or the actual, extracted from the noisy data mean spectrum (red curve). b Comparison of the “true” (red curve) and the actual (blue filled) mean spectra for the dataset with dose 1