Franz discusses confidence regions on ratios.
Hague et al. discuss statistical tests for deviations from the power-law for the cosmic ray energy spectrum.
Lang & Hughes investigate the ability to localize SMBH mergers from the GW signal.
Comastri & Brusa review AGN results from X-ray surveys and their multiwavelength follow-up and consider that case for 2-3 Msec XMM survey.
Rapetti & Allen consider what it would take to use X-ray observations of cluster of galaxies to determine dark energy parameters with a precision comparable to other methods.
Brunetti et al estimate hard X-ray fluxes from clusters of galaxies and relate them to prospective observations with SIMBOL-X.