  The flux upper limits of the diffuse gamma rays, from the inner and outer
Galactic planes, are revised by factors of 4.0$\sim$3.7 for mode energies
3$\sim$10 TeV, respectively, by using the simulation results of the effective
area ratios for gamma-ray induced showers and cosmic-ray induced ones in the
Tibet air shower array. In our previous work, (Amenomori et al., ApJ, 580, 887,
2002) the flux upper limits were deduced only from the flux ratio of air
showers generated by gamma rays versus cosmic rays. The details of the
simulation are given in the paper (Amenomori et al., Advances in Space
Research, 37, 1932, 2006). The present result using the same data as in ApJ
suggests that the spectral index of source electrons is steeper than 2.2 and
2.1 for the inner and outer Galactic planes, respectively.
