Y axis unit of bond length distribution from Forcite analysis

Hi everyone,
Recently I conducted a series of MD simulation using Discover, and then obtained the bond length distribution from Forcite analysis, but the Y axis is in 1/angstrom, not fraction. In my understanding, the vertical axis should be probability in fraction, and in published papers it's also usually expressed in dimensionless fraction.
Is there anyone who have experienced this kinda problem before?

Thanks a lot in advance!

Best regards,
Wesley