On the observability of T Tauri accretion shocks in the X-ray bandG. G. Sacco, S. Orlando, C. Argiroffi, A. Maggio, G. Peres, F. Reale and R. L. CurranA&A, 522 (2010) A55DOI: https://doi.org/10.1051/0004-6361/201014950