[R-meta] question on resolution forestplot in metafor

[Frank van Boven]

Dear all,

I have a question on improving the resolution of a forestplot in metafor.
When printing it appears to become grainy.
I always chose the standard packages (Formula and metafor), enclosed the 
script for the plot.

forest(res, slab = paste(new$Author, new$Year, new$Intervention, sep = ", 
"), xlim = c(-12, 8), alim = c(-4,4), ilab = (new$Baseline), ilab.xpos = 
c(-4.5), cex = 0.75)
op <- par(cex = 0.75, font = 2)
text(-12, 7, "Author; Year and Intervention", pos = 4)
text(-5, 7, "Baselineload", pos = 4)
text (-5, 6.5, "[ug/g dust]", pos = 4)
text(8, 7, "Std. mean difference", pos = 2)
text (8, 6.5,"[95% CI]", pos = 2)
par(op)

Is there any code known to improve a resolution to 300 dpi needed, or 
additional package to use?
Thanks for your help.

Kind regards,

Frank van Boven

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