# [Excel] How to make a tensile line chart

You can’t fill the area between series in a line chart, but it’s possible to achieve a similar effect using error bars.

### Design notes

• The error bars are colored with a gradient that replicates color encoding used for the series. A more neutral option could be used.
• Since it’s a gradient between two colors, you can remove the intermediate steps.

### Notes

• The error bars are calculated subtracting one series from the other. When imports are higher than exports this formula was used:

``````=IF([@Imports]>=[@Exports],[@Imports]-[@Exports],NA())
``````
• When exports are higher than imports:

``````=IF([@Exports]>[@Imports],[@Exports]-[@Imports],NA())
``````

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