X-Shooter spectra around the Ca ii H & K lines of SDSS J0929+0238 (the spectrum is vertically displaced by 1 unit for display purposes) and SDSS J1035+0641. The dotted lines mark the position of the stellar Ca ii H &K lines. The CH lines are much more prominent in the former because the carbon abundance is almost 1 dex larger and the effective temperature is almost 300 K cooler.
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