I want to label a plot's points in excel with neither the x nor the y variable but a label that is in a cell where the row happens to be. So for example, if I have the following table data:

```
1 1 a
2 4 b
3 8 c
4 16 d
5 32 e
```

I want the point `(1,1)`

in the chart to be labeled as a in the plot, and the point `(5,32)`

labelled as "e".