Avi Gross has been helping me with ggplot lattice plots. When he sends me graphs he has created (on a windows computer I think), if I view those on my iPad I can see a vague grid in the background on each panel. I would like to have that effect in the graphs I produce. However, when I view his graphs on my iMac, or if I use his code to produce a graph on my iMac, the grids disappear. How can I get the grids to show in the graphs I produce?
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