  We calculate the spectra of two-component accretion flows around black holes
of various masses, from quasars to nano-quasars. Specifically, we fit the
observational data of M87 very satisfactorily using our model and find that the
spectrum may be well fitted by a sub-Keplerian component alone, and there is
little need of any Keplerian component. The non-thermal distribution of
electrons produced by their acceleration across the standing shock in the
sub-Keplerian component is enough to produce the observed flat spectrum through
the synchrotron radiation.
