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(a) Normal-colorbars; (b) COVID-19-colorbars; (c) pneumonia-colorbars. (d) Normal nipy_spectral; (e) COVID-19 nipy_spectral; (f) pneumonia nipy_spectral. (g) Normal-viridis. (h) COVID-19-viridis. (i) Pneumonia-viridis (other image preprocessing results).
