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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