The surface density of luminous matter in a galaxy has units of mass per area and obeys the equation:

\[D(r) = D_0 e^{-r/r_0}\]

where \(D_0\) is some constant with units of mass per area. Suppose we have some galaxy where \(D_0 = .25 \text{ kg}/\text{m}\). What is \(D(2r_0)\) in units of \( \text{ kg}/\text{m}\), to the nearest thousandth?

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