Xrt And Shinx Joint Flare Study: Ar 11024

XRT Detection of Hot Plasma in Active Regions and Nanoflare Heating

XRT Light curves: Morphology, Flares and Energy

XSB: Extending Prolog with Tabled Logic Programming

XSL: The X-Shooter Spectral Library

XSPEC 12: Capabilities for Coded-Mask Spectral Analysis

XSPEC Model "PHOTOION": Modelling X-ray Photoionized Plasmas Wherever They May Occur

XSPEC Models of Magnetic Neutron Stars with Hydrogen and Mid-Z Element Atmospheres

XSPEC12: Object-Oriented X-Ray Analysis

XSPEC: An X-ray spectral fitting package

XSPEC: Progress and Plans

XSPEC: Progress and Plans

XSPECT telescopes on the SRG: optical performance

Xspect, estimation of the angular power spectrum by computing cross-power spectra with analytical error bars

XSPECT: A Telescope Spectrometer System on SPECTRUM RÖNTGEN-GAMMA

XSS J0056+4548 : a hard X-ray intermediate polar in the period gap

XSS J00564+4548 and IGR J00234+6141 -- new cataclysmic variables from RXTE and INTEGRAL all sky surveys

XSSJ1227.0-4859: a misterious LMXB with gamma-ray association to 1FGLJ1227.9-485

XSTAR: A program for calculating conditions and spectra of photoionized gases

XString: XML as a String