“…There is a consensus that the shock front of the supernova remnant IC 443 is colliding with a cold molecular cloud. The interaction is probably simultaneously responsible for the cold shocked gas observed at 21 cm (Giovanelli and Haynes 1979), the bright optical filaments in the NE portion, and the X-rays emitted from much of the region (e.g., Petre et al 1983;Watson et al 1983). The spectral energy distribution at X-ray wavelengths is thermal and characterized by logT near 7.0, and may be explained by a Sedov blast-wave model (Winkler and Clark 1974;Malina, Bowyer, and Lampton 1979), indicating that the remnant is probably in its adiabatic, middleaged phase.…”