[lammps-users] Question about compute heat/flux command

Dear Lammps users:

      I am learning compute heat/flux command. There are two questions:
      1: in the following equation, how does the unit of the right
side of equal sign equal that of left side of equal sign?
kappa (KCal/(mol fmsec Ang K)) = V/(k_B*(T^2)) x "thermo" output
frequency x timestep x Integral value

      2: I use correlate.py to calculate the integral of the
autocorrelation, the command is correlate.py flux.log -c 3 -s 200,
when I change 200 to 1000 or something else, the result is different,
why? How can I get the accurate result?

      Thank you very much in advance!