A chart corridor is a selected part of plot area located between two line chart series. Multiple corridors can be created.
The example of a corridor with two-color gradient fill:
To set up line chart corridor parameters, use the Chart Corridors group of parameters on the parameters panel.
Open the Chart Corridors group of parameters
Open the corridor settings panel, click the Add Corridor button to add a new corridor or double-click the existing corridor to edit it:
Set the parameters:
Series. Select the first and the second corridor series in the Series 1 and Series 2 drop-down lists.
Fill. In the drop-down list select corridor fill method:
Solid Fill. Default value. Select a solid fill color for corridor background in the drop-down palette or set it in the RGB or HEX format. If required, specify fill transparency degree.
Two-Color Fill. Select start and end colors of the two-color gradient in the drop-down palette or set them in the RGB or HEX format. If required, specify fill transparency percent.
Name. Set a corridor name to be shown in a legend.
Show in Legend. Select the checkbox to show a corridor in a legend.
Click the Add Corridor button to save new corridor settings and add it to the chart.
NOTE. When the existing corridor is edited, the Add Corridor button is not available. Changed corridor settings are saved automatically.
To delete the corridor, hover the cursor over it and click the 
Delete button.
See also:
Parameters button on the toolbar, then select the required group.