Fig. 4From: Review of multidimensional data processing approaches for Raman and infrared spectroscopy a Raw and b preprocessed Raman spectra of muscles from control Canton-S (CS) 2 days old flies. The dark shaded areas correspond with the average Raman intensity +/− one standard deviation. The differentiating Raman features are enhanced by preprocessing the data, which reduces the variability among the spectra from the same groupBack to article page