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When a chunk that includes plotting is reused the plots are not referenced properly, i.e. they are identical for both chunks though they are supposed to be different. What can I do about it?
## Test
```{r}
col <- "black"
```
```{r chunk1}
plot(0, col=col)
```
```{r}
col <- "red"
```
```{r chunk1}
```
You should use a different label like
See http://yihui.name/knitr/demo/reference/