Hi Steve, The DEFINE AXIS command defines the coordinate axis of your data -- the locations of data points. It does not describe the appearance of a physical axis drawn on a plot. See "Chapter 6: CUSTOMIZING PLOTS -- 3. Axes" in the Ferret Users Guide at http://www.ferret.noaa.gov/Ferret/Documentation/Users_Guide/current/fer_html.htm for a discussion of customizing the axes of a plot. You may, however, need to resort to manual labels on your axis to get 100% control over which tic marks get labeled. - Steve ================================== guimond@coaps.fsu.edu wrote: Hi Ferreters, |