maxwellian_ring_grad — maxwellian_ring

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

maxwellian_ring_grad(p_perp, p_par, n, p_width, p_rad, K)

Arguments

p_perp	`numeric` value of perpendicular momentum component
p_par	`numeric` value of parallel momentum component
n	`numeric` particle density.
p_width	`numeric` Width of ring momentum distribution
p_rad	`numeric` Radius of ring momentum distribution
K	`numeric` Integration constant

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