calculation of thermal conductivity from heat/flux

Dear all,

I have a question in calculation about the "compute heat/flux command"
page(http://lammps.sandia.gov/doc/compute_heat_flux.html).

According to the document in this page, thermal conductivity is
defined as "V/(kb T^2) *integral(<Jx(0)><jx(t)>)dt".

Why does the input file example shown in this page calculate thermal
conductivity as below?

variable scale equal \{convert\}/{kB}/$T/$T/$V*s\*{dt}
variable k11 equal trap(f_JJ[3])*${scale}

I think this calculation means thermal conductivity is defined as
"1/(V kb T^2) * integral(<Jx(0)><jx(t)>)dt".
What makes this difference of way to use V?

The script has been tested, so I think it is just a typo
in the doc formula.

Steve