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Figure 9
The heat map in QT of all two-dimensional lattices extracted from 870 000+ crystal structures in the CSD. The colour of each pixel indicates (on the logarithmic scale) the number of lattices whose projected invariant [{\rm PI}(\Lambda)] = (x,y) = [(\bar{r}_{02}-\bar{r}_{01},3\bar{r}_{12})] belongs to this pixel. The darkest pixels represent rectangular lattices on the bottom edge of QT.

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