Fig. 3
![Fig. 3](http://media.springernature.com/full/springer-static/image/art%3A10.1186%2Fs13007-017-0242-y/MediaObjects/13007_2017_242_Fig3_HTML.gif)
SERS spectra reveal the differences among cultivars of Flos Chrysanthemum. a Spectrum and image of Golden Queen cultivar. b Spectrum and image of Mini Red Peach cultivar. c The differences between these two spectra. d The contrast between their distribution patterns of normalized characteristic peaks