This is a collection of experimental data and output files that were used to produce the data reported in the following publication: Jonathan Frassineti, Pietro Bonfà, Giuseppe Allodi, Erick Garcia, Rong Cong, Brenden R. Ortiz, Stephen D. Wilson, Roberto De Renzi, Vesna F. Mitrović, and Samuele Sanna "Microscopic nature of the charge-density wave in the kagome superconductor RbV3Sb5", Phys. Rev. Research 5, L012017 (2023) Calculations were performed using the open-source code Elk which can be downloaded from https://elk.sourceforge.io. DESCRIPTION AND CONTENT OF FOLDERS: 121Sb: Nuclear Quadrupoler Resonance spectra for 121Sb appearing in the manuscript. The file '121Sb_DFTfrequencies_2ndNQRTransition_CDWphase.txt' contains the prediction based on DFT calculations included in this archive. 51V: Nuclear Magnetic Resonance spectra for 51V appearing in the manuscript. 87Rb: Nuclear Magnetic Resonance spectra for 87Rb appearing in the manuscript. DFT: Lattice structure (GEOMETRY.OUT), Electric Field Gradient (EFG.OUT) and computational details (INFO.OUT) for the atomic structures of RbV3Sb5 considered in the manuscript.