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| Joint Astronomy Centre |
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Nominal zeropoints for a 5 arcsecond aperture at an airmass of 1.0 are given below. A larger field stop was installed in February 2003 leading to less vignetting at L' and M', and larger zeropoints. Note that the zeropoint is a function of airmass, can vary from night to night, and will be smaller than these values if the seeing is very poor.
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