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R can produce and expert quite good publication-quality diagrams and they are divided into two types: high-level functions that open a new graphical window and set up a coordinate system (table A1.4) and low-level functions that annotate pre-existing plots (table A1.5)

First step in doing any programming is to know where to seek help. Here demonstrate how to seek help in R programming. These keywords include: help(), ?, apropos and example.