Hallo Hein, mostly it helps to make a plot first with "shade" and to use "fill/over" to get the desired figure. Best, Martin Hein Zelle wrote:
Dear Ferret users / developers, I've run into an old problem with the fill command. It seems to leave random corners of the plot blank, as if it's forgetting to include the data point at the corner of the plot for the interpolation. There is an old post in the archives about this where Ansley suggested setting a bigger data region than the plot window, but this doesn't help.