  We study the form factor of the lowest component of the stress-tensor
multiplet away from the origin of the moduli space in the spontaneously broken,
aka Coulomb, phase of the maximally supersymmetric Yang-Mills theory for decay
into three massive W-bosons. The calculations are done at two-loop order by
deriving and solving canonical differential equations in the asymptotical limit
of nearly vanishing W-masses. We confirm our previous findings that infrared
physics of `off-shell observables' is governed by the octagon anomalous
dimension rather than the cusp. In addition, the form factor in question
possesses a nontrivial remainder function, which was found to be identical to
the massless case, upon a proper subtraction of infrared logarithms (and finite
terms). However, the iterative structure of the object is more intricate and is
not simply related to the previous orders in coupling as opposed to
amplitudes/form factors at the origin of the moduli space.
