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- X-ray Single Crystal Structure 1
- X-ray structural 1
- X-ray structure 16
- X-ray structures 2
- X-ray telescope 2
- X-ray transient 1
- X-rays 2
- X-rays: binaries 6
- X-rays: bursts 1
- X-rays: galaxies 7
- X-rays: galaxies: clusters 2
- X-rays: individual 1
- X-rays: stars 2
- Xanthene dyes 1
- Xchromosome 1
- XDR 1
- Xenogryllini 1
- Xenon 1
- XMM-Newton 1
- XTMS 1