Figure 7.1 Modifying a circle grob R code	Figure 7.2 Editing grobs R code	Figure 7.3 The structure of a gtree R code	Figure 7.4 Editing a gtree R code
Figure 7.5 Using a gtree to group grobs R code	Figure 7.6 Packing grobs by hand R code	Figure 7.7 Calculating the size of a grob R code	Figure 7.8 Grob dimensions by reference R code
Figure 7.9 Calculating grob locations R code	Figure 7.10 Calculating null grob locations R code	Figure 7.11 Editing the graphical context R code	Figure 7.12 Editing the grobs in a lattice plot R code
Figure 7.13 Working with ggplot2 grobs R code