As you probably know, your USRBIN is giving you a 3D map of the energy deposited in the range you defined.
I guess you have created the plot of the Bragg peak using Flair, in particular by making a 1D projection of your USRBIN. If so, a file with extension .dat and name equal to that one used for the projection plot in Flair is created in the same directory where your .flair project is.
For example, using this course exercise, we have pretty much the same situation as you describe. When I produce the plot, such a file is automatically generated (see below). It contains the data used to make the plot.