Detection of X-ray line emission from the shell of SNR B0540-69.3 with   XMM-Newton RGS
  We present X-ray observations of PSR 0540-69.3 with the XMM-Newton observatory. The spectra obtained with the Reflection Grating Spectrometer reveal, for the first time, emission from ionized species of O, Ne and Fe originating from the SNR shell. Analysis of the emission line spectrum allows us to derive estimates of the temperature, ionization timescale, abundances, location, and velocity of the emitting gas. 
K.J. van der Heyden, F. Paerels, J. Cottam, J. S. Kaastra, and G.   Branduardi-Raymont