taking experimental uncertainties into account, the peak reduces in height and shifts to higher $q$ when the attraction is increased (inset Fig. \[fig:sqLo\](a)). In detail, the peak position, $q^*$, remains constant (at $q^* R \approx 3.8$, samples A–D) until just before we enter the attractive glass region (sample E), whereupon it increases by $\approx 5\%$ to reach another constant value ($q^* R
\approx 4$, samples F–H). These samples have approximately constant $\phi$ (in fact it decreases slightly from A to H, Fig. \[fig:phasediag\]). The increase in $q^*$ is the result of a significant fraction of neighboring particles becoming trapped in each others’ narrow depletion potential well when the attractive glass forms. Quantitatively, a 5% increase in $q^*$ corresponds to a 15% increase in the local packing fraction, from 0.6 to 0.69; the latter is the random close packing volume fraction for our system (measured by spinning down a sample of known $\phi$). In other words, the nearest particles in the attractive glass are practically touching.

The clustering of particles at constant volume necessarily implies that the average number of nearest neighbors should decrease, and that ‘holes’ are opened up to render the structure more inhomogeneous on the spatial scale of 