This file contains raw data for the manuscript: "Monolayer and thin h–BN as substrates for electron spectro-microscopy analysis of plasmonic nanoparticles" Tizei LHG et al, Applied Physics Letters 113, 231108 (2018). The data is electron energy loss spectroscopy (EELS) hyperspectral images of gold nanotriangles on different substrates. Data can be opened and manipulated using Hyperspy (www.hyperspy.org), Numpy and Matploplib libraries available in Python 3. The file formats used were HSPY (based HDF5 open standard) and MSA. Each folder contains the following data for all the triangles used in the manuscript: 1) One annular dark field image of the triangle in HSPY format; 2) One spectrum image aligned (the zero-loss speak is set to 0 eV) in HSPY format; 3) Three spectra, one for each tip, already after deconvolution (20 steps using a home-made script in Digital Micrograph) in MSA format; 4) The zero-loss spectrum used for the deconvolution of the data in MSA format; The file names have a specific format to facilite scripting: 1) finishes with "Calibrated.hspy"; 2) finishes with "aligned.hspy"; 3) finishes with "TipX.msa" where X is 1, 2 or 3; 4) finishes with "Summed.msa"; Data acquisition parameters are described in the manuscript: Tizei LHG et al APL 113, 231108 (2018).

This work was partially funded by National Agency for Research under the program of future investment TEMPOS CHROMATEM with the reference ANR-10-EQPX-50, Alexander von Humboldt Foundation through a Feodor Lynen Fellowship and MEXT,Japan, and the CREST (JPMJCR15F3), JST