3D x-ray tomography and 2D scanning electron microscopy (SEM) data behind the publications: Salling, F.B, Jeppesen, N., Sonne, M.R., Hattel, J.H., Mikkelsen, L.P. Individual Fibre Inclination Segmentation from X-ray Computed Tomography using Principal Component Analysis, Journal of Composite Materials, 56, 83-98, https://doi.org/10.1177/00219983211052741, 2022. to where the reference should be given if used. Details on the data-set is given in the supplementary document found together with the data The data-files is given for the two material case called Mock and UD. For each material case, the data is given as: .txm-files: 3D reconstructed x-ray scan files FoV 2mm binning 2 (analyzed in the paper) FoV 4mm binning 1 (additional data-set) 2Dtif.zip-files: 2D tif-stack version of the 3D reconstructed data-set .tif-files: stitched SEM scanning file used for fiber volume fraction determination .hdr-files: meta-data ASCII file behind the SEM scan tif.zip-files: The individual images behind the stitched SEM scanning file fig-files: digital form of the fibre trajectories colored according to their individual mean inclination used in figure xx in reference yy m-files: Matlab-script for calculating the fibre volume fraction (Vf) from the SEM image mat-files: Mat-file with the segmented part in the SEM image used for the Vf calculation