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  • CTIO site-average values for first-order Extinctions for SDSS u'g'r'i'z' can be found at the end of Table 4 of Smith, Tucker, Allam, et al.. They are:
filter k [mag/airmass]
u' 0.489±0.002
g' 0.181±0.001
r' 0.095±0.001
i' 0.089±0.001
z' 0.053±0.001