Spectra of highly charged At, Kr, Xe and Fe ions, produced in an Electron B
eam Ion Trap (EBIT), have been recorded in a broad X-ray energy band (0.2 k
eV to 10 keV) with a microcalorimeter detector. The first analysis of the K
r spectra has been completed and most of the spectral lines have been ident
ified as transitions of B- to Al-like Kr. Line intensity ratios of Fe XVII
have been measured and compared with theoretical models.