dy exp-2 kBT 0 dy kOt Maxwellian can be written as 3/2 n(v 4 2 exp d m0 2 1 exp d d B 2 2 =                 − k T mv v v m k T v B m 2 = v v v v N v n v exp d 1 4 d ( ) 2 2 m 2 3 2 2 m         −          =  Maxwellian can be written as