Bio-Rad EXQuest Spot Cutter - Manual (Page 175)

PDQuest User Guide
5-24
Fig. 5-14. Overlapping gels with narrow pH range
To combine gels with narrow-range pHs, select the most acidic gel as your Master
template.
If you select Match > MatchSet tool you open the Combine Narrow-Range Gels, or
Cybergel dialog.