What's the meaning about DL and DT?

I have generated the N2 gas file and then PlotElectronDiffusion in the field, but there are two curves in the plot, one is DT, one is DL, and what the curve represent separately?

The two curves show the transverse and longitudinal diffusion coefficients.

Ah, Thanks a lot. I know it now.

I have also generated the Ar_90_CH4_10.gas, the electron diffusion coefficient show in the below, why the transverse diffusion coefficient is almost the same,but the longitudinal diffusion coefficient changes a lot?

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