Results from this experiment included the discovery of soft X-ray emission
from the supernova remnant MSH 14-63 and of rapid pulsations (0.716 s) from
the binary SMC X-1. Due to the (comparatively) short duration of the
Apollo-Soyuz mission, little other science of note was done with the
proportional counter system. In addition, the detector had a moderately
high background level that steadily increased through the duration of the
mission until almost no X-ray sources were discernible. The cause of the
background problems remains unknown.
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