ReferenceLine:Hardcoded: y with symbols

Build 803 on 2131-clean-up-stories-to-fully-enable-chromatic
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Baseline History
Build 8031b7af1d
Current build. There are unaccepted changes, so build 796 is still the baseline.
Build 796e7dd182 current baseline
Accepted by Zach Stence.
Build 793e7dd182
Accepted by Zach Stence.
Build 771e7dd182
Accepted by Zach Stence.
Build 768e7dd182
Accepted by Zach Stence.
Commenting is disabled because there's a newer build on this branch