wells.

At other wave vectors, Figs. \[fig:up0.6qp\] and \[fig:up0.6q70\], the DSFs behave in a similar way, namely relatively low plateaus in the repulsive glasses A and B, complete decay in the metastable fluids C–E, and extremely slow dynamics in the attractive glasses F–H, with very high points of inflection in G and H. Note, however, that at the peak of the corresponding SSFs, the DSFs for samples C–E are barely distinguishable (Fig. \[fig:up0.6qp\]).

The plateaus in the DSFs of the repulsive glasses can be used as a measure of $f(q,\infty)$, the non-ergodicity parameter. An estimate of this quantity for the attractive glasses is more problematic, partly due to significant aging in our time window. To proceed, we use the value of $f$ at the point of inflection as a surrogate; we call this the ‘measured’ $f(q,\infty) \equiv f^{(M)}(q,\infty)$. The evolution of $f^{(M)}(q,\infty)$ with increasing polymer concentration (samples A–H) is shown in Fig. \[fig:inftycp\]. The non-ergodicity parameter decreases slightly when moving from A to B, away from the hard-sphere glass. When attraction melts the repulsive glass, $f^{(M)}(q,\infty) = 0$ for samples C–E (not shown). Sample F did not crystallize and showed non-ergodic dynamics up to $10^4$ seconds but did not exhibit 