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We have observed the prototypical dwarf nova U Gem at quiescence with the Chandra medium-and highresolution gratings to accomplish the first study of resolved X-ray emission lines in a disk-accreting cataclysmic variable. Doppler tomograms constructed from optical spectra obtained close in time to the X-ray observation show a typical quiescent disk structure with an irradiated secondary but no prominent disk hot spot. The unprecedented spectral resolution of Chandra over past X-ray telescopesdoi:10.1086/341006 fatcat:icfjteuw7ffiniuawnwiobkhyq