Hi,
Yes, I use these codes to create my graph
NO2 <- ggplot(data=data,aes(x=Station, y=NO2, fill=Tide)) +
geom_boxplot()+
scale_fill_manual(name="Tide", values = c("Orange", "green")) +
xlab("Stations") +
ggtitle("Nitrite") +
ylab("µmol/L") +
theme_bw() +
theme(plot.title = element_text(hjust = 0.5))
Thanks