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

This directory provides two subdirectories for 8-day (full IBEX orbit) files containing time-of-flight (TOF) and angular histograms. Each of the two subdirectories (TOF, angular) itself has energy-band-specific subdirectories. Each energy-band-specific subdirectory has a mix of species-specific data files (hydrogen, oxygen plus carbon, and, for TOF, a mix of species labelled "All.")

This directory also contains a documentation file created by the IBEX team, Maps_TOF_description.txt.

The content of the two types of histograms are described in the readme's of their respective subdirectories.