In reading the documentation for USRTRACK, I was hoping to get some clarification on it’s entry.
Note 1. says
The results of USRTRACK are always given as differential distributions of fluence (or tracklength, if the detector region volume is not specified) in energy, in units of cm^-2 GeV^-1 (or cm GeV^-1) per incident primary unit weight. Thus, for example, when requesting a fluence energy spectrum, to obtain integral binned results (fluence in cm^-2 or tracklength in cm per energy bin per primary) one must multiply the value of each energy bin by the width of the bin (even for logarithmic binning). This is done automatically by the dedicated post-processing utility program
USTSUW
(see Note 7).
Processing USRTRACK with FLAIR calls the USTSUW program. Based on Note 1., bolded wording, makes it sound like the result from processing USRTRACK with FLAIR would be integral binned results with fluence in cm^-2 per energy bin per primary.
However, Note 7. says
It returns differential and cumulative fluence, with the corresponding percent errors, in a file, and differential fluence in another file formatted for easy plotting. It also returns a binary file that can be read out in turn by
USTSUW
.
Where the actual output from FLAIR calling USTSUW is
**** Different. Fluxes as a function of energy **** **** (integrated over solid angle) ****
Flux (Part/GeV/cmq/pr):
and
**** Cumulative Fluxes as a function of energy **** **** (integrated over solid angle) ****
Cumul. Flux (Part/cmq/pr):
Neither of which are fluence in cm^-2 or tracklength in cm per energy bin per primary.
Am I misinterpreting the manual?