We present a new atmospheric extinction curve for Mauna Kea spanning3200--9700 \AA. It is the most comprehensive to date, being based on some 4285standard star spectra obtained on 478 nights spread over a period of 7 yearsobtained by the Nearby SuperNova Factory using the SuperNova Integral FieldSpectrograph. This mean curve and its dispersion can be used as an aid incalibrating spectroscopic or imaging data from Mauna Kea, and in estimating thecalibration uncertainty associated with the use of a mean extinction curve. Ourmethod for decomposing the extinction curve into physical components, and theability to determine the chromatic portion of the extinction even on cloudynights, is described and verified over the wide range of conditions sampled byour large dataset. We demonstrate good agreement with atmospheric science dataobtain at nearby Mauna Loa Observatory, and with previously publishedmeasurements of the extinction above Mauna Kea.
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