Strong relationship ER and K600.

Thanks for submitting your issue or question. We can address issues fastest if they are:

* New - search past issues first to see if your question has already been answered. Reopen an old issue if your question was almost but not quite answered.

* Complete - share all relevant code and console output/errors/warnings, in the order they were run and produced on your computer. Also include the output from a call to `devtools::session_info()` to tell us about your computer's configuration.

* Reproducible - include all the data and code necessary for us/others to recreate the problem locally. It's fine to make up data if you can't share yours, as long as the problem still comes through.

* Minimal - what is the smallest amount of data and code you can use to demonstrate the problem? This is less essential than the others but improves communication and our response time.

Delete these instructions before submitting your issue.

---

### Brief problem description

### What you saw on your computer

Include all code you ran (a minimal example) and all console output, errors, and warnings. Include a data file if needed.

```r

```

### Session information

Run the following code line (or `sessionInfo()` if that doesn't work) and paste in your output.

```r
> devtools::session_info()

```