This Maplet plots an Ellipsoid with parameters a, b, and c, together with traces and planes through the traces. Plots of the individual traces appear to the right of the Ellipsoid plot. The parameters a, b, and c are chosen using the sliders. Moving the sliders re-draws the plots. Sliders may be moved with the mouse or changed incrementally by selecting with the mouse and then using the arrow keys. Trace values must be entered in the textboxes below the individual plots, and the plot button clicked to redraw the plots. The trace values must each be strictly less than the corresponding parameter values or the trace plots will be empty. Slider bars on the plot window adjust the viewing angle. Checkboxes below the ellipsoid plot toggle the traces and planes on and off. Various buttons on the menu bar change the appearance of the plot.