The article is very precise: "Both teams identified the carbon dioxide using data from the integral field unit of Webb’s Near-Infrared Spectrograph (NIRSpec).

The article is very precise: "Both teams identified the carbon dioxide using data from the integral field unit of Webb’s Near-Infrared Spectrograph (NIRSpec). This instrument mode provides spectra with a resolution of 200 x 200 miles (320 x 320 kilometers) on the surface of Europa, which has a diameter of 1,944 miles, allowing astronomers to determine where specific chemicals are located." Wikipedia article about the NIRSpec: https://en.wikipedia.org/wiki/NIRSpec https://en.wikipedia.org/wiki/NIRSpec