Filling Contours
Fields between color isolines can be filled. The
Objects->Color Filling menu adds or deletes the fill.
The Objects->Color Scale menu shows or hides the color
scale.
Double click the color inside the orthogonal color scale to change this
color.
Double click the white background inside the orthogonal color scale or
use the
button to change the type.

The Minimum and Maximum buttons change the
colors corresponding to the range of parameter values. The whole palette changes. One can
also change the representation of digits on the scale.