https://spdf.gsfc.nasa.gov/pub/data/ibex/release3/lo/mass_spectrometer_data/TOF_histograms/band_5/aareadme.txt

For each 8-day orbit, this directory provides three 8-day,
CSV-formatted files containing time-of-flight (TOF) histograms 
for energy band 5.  Each triad of files is for hydrogen, for 
oxygen and carbon (labelled "Oxygen") and for hydrogen and 
oxygen and carbon (labelled "All")

Energy band 5 has center energies of 209 and 279 eV for hydrogen 
and oxygen, respectively.

The directory two levels up contains a documentation file 
created by the IBEX team, Maps_TOF_description.txt.

The TOF histograms give the numbers of counts in a given
time-of-flight range, for each 0.33ns TOF band from 0-0.33ns
to 339.67-340ns, as accumulated over the full 8-day orbit,