Dear Ferret users Can anyone tell me a quick way to draw a line across a plot to show where x or y is zero when it's not on the boundary of the plot? For example the equator on a plot which extends from 30s to 30n north or where U = 0 on a plot which has the y axis extending from -20 to 20? Thanks a lot. Mark Mark Williams Supervising Meteorologist Victorian Regional Office ph 61 3 9669 4902