With this feature...
Do this...
smooth grid
Drag to increase or reduce the smoothing on residual maps and top contour overlays.
trend components removing
Drag to increase or reduce harmonic trends on residual maps.
show subsea contours
Toggle whether to superimpose the contours of the top upon which your residual map is based.
thin 
thick contour step
Type the z-value at which contour steps should appear.
color
Double-click the color to display the color palette popup and select the desired contour color.
label freq
Type the frequency with which Z-value labels should
appear on the contour lines.