Since usually cτ c /D ≫ 1, Eq. 35 has a sharp maximum value at ω c = ω 0 and tails toward the ω c < ω 0 side. VSC (Eq. 33) where the number of modes M is divided, which is identical to the single mode case in Eq. 17. (b) FGR rate profiles for many mode cases inside a 2D FP cavity, where the results obtained by performing direct sum using Eq. 29 (solid lines) and by performing integration using k2D