Fig. 4

(A) SHG/THG images of cross section of a fresh hypertrophic scar skin sample, measured with the cross-section face to the objective. Color maps (B - D) and histogram distributions (E - G) of \(\chi _{33}/\chi _{31}, \chi _{15}/\chi _{31}\) and \(\alpha\)-helix pitch angle for two boxed regions.