Toward the Galactic center, the near-infrared extinction index is constant along the line of sight but differs between the JH and HKs band pairs by about 0.19, so a single power-law index for JHKs is not accurate.
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Variability of the near-infrared extinction curve towards the Galactic centre
Toward the Galactic center, the near-infrared extinction index is constant along the line of sight but differs between the JH and HKs band pairs by about 0.19, so a single power-law index for JHKs is not accurate.