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### Overview

Describe the issue. What is the issue and what did you expect?

Please make sure to review and check all of these items:

- [ ] Use latest version of the library
- [ ] Make sure you've included all the dependencies e.g Chart.js, angular, css file
- [ ] Include a repro case, see below.


### Step to reproduce

**Ensure you add a link to a plunker, jsbin, or equivalent.** 
Here is a [jsbin template](http://jsbin.com/dufibi/3/edit?html,js,output) for convenience.