The width of the outline on one side of the polyline depending on the map measure. The total width of the polyline is line width + 2 * outline width.

At map measures smaller than smallest map measure in the outlineWidth, outline width is constant and equal to the width given for the smallest map measure in the outlineWidth.

At map measures bigger than biggest map measure in the outlineWidth, outline width is constant and equal to the width given for the biggest map measure in the outlineWidth.

At map measures between two nearest given map measures, the values are linearly interpolated between values given for these map measures. Gets the map measure dependent polyline outline width.