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X-ray Transients
After some 30 years of observations, it is clear that X-ray transients
can be divided into two classes - those associated with massive X-ray
binaries and those associated with low mass X-ray binaries. The two
classes display different spectra, with the massive systems tending to
be "hard" (or hotter) and the low mass systems tending to be "soft" (or
cooler).
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