\magnification = \magstep2


$$
I(r) \quad = \quad I_0 e^{-r/R}
$$

$$
\mu(r) \quad = \quad \mu_0 + {{r}\over{D}}
$$

$$
I(r) \quad = \quad I_0 \thinspace e^{-K \left[ ({{{r}\over{R}})^{1/4}} - 1 \right] }
$$


$$
\mu(r) \quad = \quad \mu_0 \thinspace {- \thinspace K \left[ { \left( {{r}\over{R}} \right)^{1/4}} - 1 \right] }
$$
\bye
