Fig. 21.

[S II] images of a supernova remnant and shells. Upper left panel: SNR a64, truncated at the northern edge of field (a); the object to the SW from the center is the optically thick H II region a10. Upper right panel: double-lobe shell d95/d96, hosting WR star. Lower left panel: double-ring shell d87/d88, reminiscent of the rings of SN1987A, however with a diameter of ∼10 pc. Lower right panel: shell b23, suspiciously aligned with the somewhat fainter shell B22.
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