Figure 23: Left: Luminosity as a function of accretion rate for neutron star and black hole sources,
illustrating that a wider range of luminosities are expected for black holes. Image reproduced by
permission from [215], copyright by AAS. Right: Recent data showing that neutron star sources (open
symbols) are systematically more luminous than black hole sources (filled symbols) in analogous
spectral states. Image reproduced by permission from [171], copyright by Elsevier.
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