  In this paper the KTeV collaboration reports the analysis of 112.1*10^3
candidate KL->pi+pi-gamma decays including a background of 671+/-41 events with
the objective of determining the photon production mechanisms intrinsic to the
decay process. These decays have been analyzed to extract the relative
contributions of the CP violating bremsstrahlung process and the CP conserving
M1 and CP violating E1 direct photon emission processes. The M1 direct photon
emission amplitude and its associated vector form factor parameterized as
|g_M1|(1+ (a_1/a_2)/(M(rho)^2-M(K)^2+2M(K)*E(gamma)) have been measured to be
|g_M1|=1.198 +/- 0.035(stat) +/- 0.086(syst) and a_1/a_2 = -0.738 +/-
0.007(stat) +/- 0.018 (syst) GeV^2/c^2 respectively. An upper limit for the CP
violating E1 direct emission amplitude |g_E1| < 0.21 (90% CL) has been found.
The overall ratio of direct photon emission (DE) to total photon emission
including the bremsstrahlung process (IB) has been determined to be DE/(DE +IB)
= 0.689 +/- 0.021 for E(gamma) > 20 MeV.
