Polarisation microscopy image data from horizontal thin sections from the EGRIP ice core were acquired with a Fabric Analyser (G50, Russell-Head Instruments). 66 sections from 18 bags were measured in the field camp at EGRIP, Greenland, during field seasons 2017, 2018, 2019, 2022, and 2023.A bag refers to an ice core segment of 55 cm length which is typically cut into six pieces of 9 cm length from which thin sections (approx. 250-300 µm thick, max. 7x9 cm²) are prepared using a manual sledge microtome. Horizontal sections were prepared only from ice core volume samples (75% of ice core from bottom of approx. every 200th bag, corresponding to depth of 6th sample in bag). Sample folders are named according to the convention EGRIP_-_. Data are not available between 2121 and 2417 m.Each section folders contains a manually prepared mask image (background.bmp) in preparation for image processing to exclude image artefacts from the sample margins. The resolution of the image data is 500 px/cm. Quality images are provided by the instrument as well as images showing crystal c-axis orientation per pixel. The binary file (data.cis) contains all relevant information to evaluate the section with regard to the crystal-preferred orientation (CPO) of the ice thin sections.

It is likely that samples 1208_6-top and 1400_6-top were accidentally permuted during data acquisition.Volume sample 400_6 was sliced in 34 horizontal sections.The depth of sample 4843_break_hor is approximate.