>>>>>>>
X, Y, Z are N(0, a), then, X^2, Y^2, Z^2, each is Chi-square distributed.
sqrt(X^2+Y^2) is Rayleigh distributed.
sqrt(X^2+Y^2+Z^2) is Maxwell distributed.
sqrt(X^2+Y^2) is Rayleigh distributed.
sqrt(X^2+Y^2+Z^2) is Maxwell distributed.
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