) We can ignore 
because
it is independent of 
and fixed for our given 
and T.
This has the practical consequence that the likelihood
is never normalized sensibly.
) 
philosophically
represents a priori knowledge of 
before experiment
(measurement of 
) performed.
This is shaky---not just because we don't really know
how to define what 
(``given T'') means
but, for instance, suppose we wish to parameterize
the simplest idea---``complete ignorance'' of 
before experiment
performed.