ReferenceLine:Hardcoded: y with symbols

Build 908 on feat/dropdown-overhaul
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BaselineBuild 755 on next
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Baseline History
Build 9087754ff6
Current build. There are unaccepted changes, so build 755 is still the baseline.
Build 7559cc959d current baseline
Accepted by Zach Stence.
Build 356ef3dd43
Accepted by Zach Stence.
Build 3525e4f34e
Accepted by Zach Stence.
Build 308f94e6d4
Accepted by Archie Sarre Wood.
Commenting is disabled because there's a newer build on this branch