Labeling contour lines in R using metR with gratia or ggplot2...

Why does ggplot scale_colour_manual na.value parameter not work?...

In ggplot2 with polar coordinates connect points with geom_path across 0/2*pi with unequally spaced ...

The command geom_contour_fill fails to render in some cases in ggplot2...

nullGrob error on plotting in ggplot2 / metR...