The atmosphere of planet Mysterio consists of a single neutral gas. On the planet's surface, the neutral gas density is 1012 particles/cm3 and the scale height is 15 km. If the absorption cross-section (o,) for this gas is 10-18 cm² (independent of wavelength) and Mysterio's sun is at a zenith angle of x = 30°, what is the optical depth at the surface? Report your answer to 3 significant digits.
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