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peterbwest (41) [Avatar] Offline
#1
We can same graph with the code
plot(dose, drugA, type="b", lty=2, pch=17)
peterbwest (41) [Avatar] Offline
#2
Re: 3.3 Graphical parameters
3.3.1 Symbols and lines

Figure 3.4 Plotting symbols

I presume that values like *, |, O, etc are specified as strings, rather than as integers. So the function call would be
par(pch="*")
and, in particular,
par(pch="0")

Note that zero (0) is valid both as an integer indicator and to specify the character "0" as a point marker.
peterbwest (41) [Avatar] Offline
#3
Re: 3.3 Graphical parameters
3.3.4 Graph and margin dimensions

Axis text will be to italic