Use matplotlib to save images

7 jobs for fixes_plot in 56 minutes and 1 second (queued for 2 seconds)
Status Job ID Name Coverage
  Build
passed #171394
docker
build_linux_36

00:51:46

72.0%
passed #171381
macosx
build_macosx_36

00:04:15

canceled #171378
docker
build_linux_36

00:30:55

failed #171389
docker
build_linux_36

00:18:12

failed #171320
docker
build_linux_36

00:40:58

failed #171379
macosx
build_macosx_36

00:00:01

failed #171321
macosx
build_macosx_36

00:00:01