We would like to thank R. Stern and S. Skinner who provided us the Ginga and ASCA data. The ROSAT project is supported by the Max-Planck-Gesellschaft and Germany's federal government (BMBF/DLR). RN acknowledges grants from the Deutsche Forschungsgemeinschaft (Schwerpunktprogramm `Physics of star formation').
© European Southern Observatory (ESO) 1999
Online publication: March 10, 1999