Make label helpers more robust

RMI-PACTA / r2dii.plot

A package containing functions to create standard 2DII plots using ggplot, together with data processing functions needed for the charts.

https://rmi-pacta.github.io/r2dii.plot

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Closed MonikaFu closed 2 years ago

MonikaFu commented 2 years ago

Closes #439

This PR makes label conversion more robust in terms of letter cases.