Hi.
The dataset looks like this but with 62 rows.

I am not interested in the third column.
Here is my code:
attach(NOAA)
library(ggplot2)
decade <- c(1960,1970,1980,1990,2000,2010,2020)
ggplot(NOAA) + geom_point(aes(x="year",y="mean",colour=decade))
I get this error message
Error: Aesthetics must be either length 1 or the same as the data (62): colour
I have no idea what the error message means in this case, though I have read about it in general.