The form of the standard extinction curve depends on the composition of the ISM, which varies from galaxy to galaxy.
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It is calculated by multiplying the standard atmospheric extinction curve by the mean airmass calculated over the duration of the observation.
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Astronomical observatories generally are able to characterise the local extinction curve very accurately, to allow observations to be corrected for the effect.
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In the Local Group, the best-determined extinction curves are those of the Milky Way, the Small Magellanic Cloud ( SMC ) and the Large Magellanic Cloud ( LMC ).
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