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2Please make sure your issue title matchs the Go convention; a summary
3of the problem, prefixed by the primary affected package.
4
5If the issue is a question about usage or similar, please ask at the
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8https://groups.google.com/forum/#!forum/gonum-dev
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10### What are you trying to do?
11
12
13### What did you do?
14<!--
15Please include a link to a minimal reproducer here. Preferably this
16should be a complete runnable example at https://play.golang.org/.
17
18If the issue involves a plot and can be replicated in an image.Image
19rendering, render the plot using pic.ShowImage(img) from the tour
20package, "golang.org/x/tour/pic".
21-->
22
23
24### What did you expect to happen?
25<!-- Please include an expected output image if available. -->
26
27
28### What actually happened?
29<!-- Please include an annotated output image if available. -->
30
31
32### What version of Go and Gonum/plot are you using?
33<!--
34Paste the output of `go version` and if you are installing Gonum/plot from source, paste
35the output of `(cd $(go env GOPATH)/src/gonum.org/v1/plot && git rev-parse HEAD)`.
36-->
37
38
39### Does this issue reproduce with the current master?
40
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