Function reference
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          geom_heat_circle()
- Heatcircle
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          geom_heat_grid()
- Heatgrid
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          geom_heat_tri()
- Heattriangle
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          ggDoubleHeat
- ggDoubleHeat: Data visualization for two sources
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          pitts_emojis
- Popular Emojis
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          pitts_tg
- Pittsburgh COVID-related Google & Twitter incidence rates
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          remove_padding()
- Remove ggplot2 default padding
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          states_tg
- States' COVID-related Google & Twitter incidence rates
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          theme_heat()
- Plot Themes