There are two ways that the Split Contour functionality of Metview 3 can be emulated (or improved upon) in Metview 4.

The first is to use three contour definitions instead of one, as shown in this comparison below.

The second method is to use the Rainbow Contouring method to do something similar in a single Contouring icon as shown in the example below. Note that this example has more sophistication in the colours than the Split Contouring in Metview 3. To get the old behaviour, contour_line_colour_rainbow_colour_list can be set to ['blue', 'blue', 'blue', 'black', 'red', 'red', 'red'].