ReferenceLine:Hardcoded: y with symbols

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Baseline History
Build 87183f2bcc
Current build. There are unaccepted changes, so build 755 is still the baseline.
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Build 356ef3dd43
Accepted by Zach Stence.
Build 3525e4f34e
Accepted by Zach Stence.
Build 308f94e6d4
Accepted by Archie Sarre Wood.
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