  The spatial distribution of the action and energy in the colour fields of
flux-tubes is studied in lattice SU(2) field theory for static quarks at
separations up to 1 fm. Special attention is paid to the structure of the
colour fields associated with an excited flux-tube with E_u symmetry. We
compare our results with hadronic string and flux-tube models. Sum rules are
used to extract generalised beta-functions, to describe the expected colour
field behaviour and to cross check the methods used.
