Options for svg graphics in RMarkdown

 These options seem to be ok:

```{r setup, include=TRUE}

knitr::opts_chunk$set(fig.path='figs/xxx_', 

                      dev='svg', 

                      concordance=TRUE, 

                      echo=TRUE, 

                      fig.width=12, fig.height=8, 

                      dev.args=list(pointsize=16))

```


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