Discovery of Galactic O iv and O v X-ray absorption due to transition temperature gas in the PKS 2155-304 spectrumJ. Nevalainen, B. Wakker, J. Kaastra, M. Bonamente, S. Snowden, F. Paerels and C. de VriesA&A, 605 (2017) A47DOI: https://doi.org/10.1051/0004-6361/201630336
