Fig. 1

This shows the $(k,q)$-temporal profiles with $\frac{l}{\mu }=1$, i.e., the functions $g_1^{(k+1)}\ast {g_1^{\prime }}^{(q+1)}$ for $q=0$ and k ranging from 0 to 6. For $k=q=0$, the temporal profile is even and this also occurs to be true for any $k=q$. When $k>q$, the function reaches its maximum for strictly positive values that grow with the difference $k-q$. Besides, the temporal profiles are flattened when $k+q$ increases.