Grouped spline areas are multi-series charts with two or more spline areas. Each spline area is filled beween the smooth curve line and the horizontal baseline with a different color. Multi-series grouped spline areas appear one behind the other. One series may totally or partially cover other series.
Our Global Sales demo charts show three separate continuous smooth curve lines joining the points at the intersection of each year value between 2000 and 2017 and the number of products sold in US, France or UK in that year. The whole areas between each line and the horizontal baseline if filled with a different palette color. These are multi-series charts and each series line and area get their own color. Grouped areas are always filled-in from zero, one behind the other, even if they may appear stacked (i.e. one above the other).