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Observations during the first week of March 1999 were mostly aimed at acquiring quantitative and qualitative information about the Mars Orbiter Camera (MOC) in the environment in which it was originally designed to operate. Chief among the" calibration"data were measurements of the camera's focus, which is very sensitive to temperature because the magnification is so high. Using heaters around the rim (outer portion) and hub (inner portion) of the primary mirror to minutely change the shape of the mirror, pictures were taken of stars--which are " point sources"for accurate measurement--and of the north polar cap and
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