https://spdf.gsfc.nasa.gov/pub/data/ibex/release3/lo/mass_spectrometer_data/angular_histograms/aareadme.txt

This directory provides energy-band-specific subdirectories for 8-day (full IBEX orbit) files containing angular histograms. For each orbit and energy-band, there are two species-specific data files (for hydrogen, and for a mix of oxygen and carbon labelled "Oxygen.")

The angular histograms give the numbers of counts in each one-degree band in spin phase, as accumulated over the full 8-day orbit.

The data files are formatted as comma separated variables (CSV) ASCII.

The parent directory contains a documentation file created by the IBEX team, Maps_TOF_description.txt, that should be read.