three-fermion system, the STM equation forms 9 coupled equations for the amplitudes ${\cal A}_{ij}
(k,p;E)$ [@Braaten:2008wd; @Braaten:2009ey]. For non-zero energy, the equation is given by $$\begin{aligned}
{\cal A}_{ij}(k,p;E) &=& (1 - \delta_{ij})\,Q(k,p;E)
\nonumber
\\
&&
+ \frac{2}{\pi} \sum_k (1 - \delta_{kj}) 
\int_0^\Lambda \! dq q^2\, Q(q,p;E) \, D_k(q;E) \,{\cal A}_{ik}(k,q;E) ,
\label{STMeq}\end{aligned}$$ where ${\cal A}_{ij}(k,p;E)$ is the amplitude for an atom $i$ and a complementary pair of atoms to scatter into an atom $j$ and a complementary pair and $\Lambda$ is an ultraviolet cutoff. The function $Q(k,p;E)$ and the 2-atom propagator $D_k(q;E)$ are given by $$\begin{aligned}
Q(k,p;E)&=&\frac{1}{2kp}\ln\left[
\frac{k^2+kp+p^2-mE-i\epsilon} 
     {k^2-kp+p^2-mE-i\epsilon}
\right],
\label{func:Q}
\\
D_k(q;E)&=&\frac{1}{-1/a_k+\sqrt{\tfrac{3}{4}q^2-mE-i\epsilon}}.
\label{func:D}\end{aligned}$$ The solutions of the STM equation depend log-periodically on $\Lambda$ with a discrete scaling factor $e^{\pi/s_0} \approx 22.7$, where $s_0 \approx 1.00624$. The dependence on the arbitrary cutoff $\Lambda$ can be eliminated in favor of a physical 3-body parameter such as the binding wave number of an Efimov trimer in the unitary limit. For convenience, we choose to work directly with the wave number cutoff $\Lambda$ in our calculations. If deep dimers are present, the trimer has a finite width that allows it to decay into an atom and a deep dimer. The effects of deep 