TERS intensity as a function of the position along the SWCNT bundle and bundle height, exemplified on RBM_7 . (a) TERS spectra in the RBM region at different positions, from (1) to (7) along the SWCNT bundle. The peaks marked with stars belong to the silicon substrate. The colored numbers correspond to the RBM numbering given in Table 2. (b) RBM_7 TERS intensity as a function of the height of the bundle at the seven measurements sites.