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We present X-ray equivalent width imaging of the supernova remnant (SNR) 3C397 for Mg He\alpha, Si He\alpha, S He\alpha, and Fe K\alpha complex lines withthe Chandra and XMM-Newton observations. The images reveal that the heavier theelement is, the smaller the extent of the element distribution is. The Mgemission is evidently enhanced in the southeastern blow-out region, well alongthe radio boundary there, and appears to partially envelope the eastern Feknot. Two bilateral hat-like Si line-emitting structures are along the northernand southern borders, roughly symmetric with respect to the southeast-northwestelongation axis. An S line-emitting shell is located just inner to the northernradio and IR shell, indicating of a layer of reversely shocked sulphur in theejecta. A few enhanced Fe features are basically aligned along the diagonal ofthe rectangular shape of the SNR, which implicates an early asymmetric SNexplosion.

Spatial Distribution of Metal Emissions in SNR 3C 397 Viewed with Chandra and XMM