I discuss the high resolution XMM-Newton Reflection Grating Spectrometer ( RGS ) spectrum of SN 1006 .
SN 1006 is one of the best examples of a supernova remnant that is far out of ionization equilibrium .
Moreover , optical , UV and X-ray data indicate that it is also out of temperature equilibrium .
I discuss the X-ray evidence for this .

In addition I discuss the lower resolution RGS spectrum of the eastern rim of SN 1006 .
Despite the lower resolution , the spectrum contains significant evidence for an asymmetric expansion velocity .
Two likely solutions fit the O VII triplet .
One with no significant thermal broadening and a shell velocity of \sim 6500 km s ^ { -1 } , and one with significant broadening and a shell velocity of 9500 km s ^ { -1 } .
The first solution seems the most plausible , as it is consistent with radio expansion measurements , which suggest a decelerated shell .