Line identifications of the principle lines areprovided Figure 4 displays spectra from three extraction regions over the remnant situated in the N, NE and SE of the remnant. The data from RGS1 and RGS2 have been combined in order to increase the statistical weight of the observation. Several lines of highly ionized species of Si, Mg, Ne, Fe L and O are detected in the spectrum. The analysis and interpretation of these spectra will be the subject of a forthcoming paper. These images were converted from wavelength to spatial coordinates using the equation , where is the offset along the dispersion direction, the wavelength shift, the angle of incidence on the gratings and d the line distance of the gratings.
Emission is seen in three blobs in the E and N rim.
The enhanced spot on the SE rim of the image indicates a Ly- emission deficit in this region. The oxygen emission is seen to originate from three blobs on the E and N rim of the remnant. This decrease seems to indicate a Ly- emission deficit in this region. These data take into account both the H I and molecular absorption and have an average resolution of 30 . Smaller-scale variations could be caused by small scale structure in the value on a angular scale.