FXCM had one color on the CR "stepped line" and I found this explanation, in another website....
Stepped Lines
Many technical indicators have an option for drawing style. These include Continuous Line, Connected Line, Solid Histogram, Hollow Histogram, Custom Histogram, and Two Line Color. a new version, is called "Stepped Line".
A Stepped Line is composed of only vertical and horizontal lines. The small horizontal line across each bar represents the indicators value on that bar, and the small vertical lines connecting these horizontal lines represent the difference between each bars value (change).
Stepped Lines have two colors, one color for the horizontal lines, and a second color for the vertical lines. This new drawing method makes it easier to visualize the change from bar to bar of an indicators value by observing the height and direction of each vertical line.
Stepped lines also make it easier to pinpoint the exact price level of the indicator, via a more pronounced horizontal line segment at each price level.