Left panel a: fitting the rest-frame UV spectrum of JADES-GS-z6 measured by JWST/NIRSpec (solid gray-shaded line) with a power-law continuum (solid blue line) attenuated mainly by the absorption of PAH molecules (solid red line). The bottom orange-shaded line illustrates the fitting residual. Right panel b: the fractional weights of the molecules that best fit the JWST/NIRSpec spectrum of JADES-GS-z6.