maxwellian_grad — maxwellian

function to calculate the gradient of a simple maxwellian momentum distribution with respect to parallel and perpencicular momentum

maxwellian_grad(p_perp, p_par, n, p_term)

Arguments

p_perp	`numeric` value of perpendicular momentum component
p_par	`numeric` value of parallel momentum component
n	`numeric` particle density.
p_term	`numeric` Particle themal momentum

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