  Dark matter constituents of many solar masses will accrete normal matter
which emits X-rays that can be downgraded to microwaves which may distort the
precisely-measured black-body spectrum of the Cosmic Microwave Background.
However, it is known from elsewhere that spherical models of accretion vastly
overestimate the amount accreted and consequently the emitted X-rays.
Therefore, exclusion plots based on spherical accretion for the allowed
fraction of the dark matter versus the MACHO mass give upper limits on
intermediate-mass MACHOs which are too severe, sometimes by orders of
magnitude.
